diff --git a/core/enhanced_dictionaries.py b/core/enhanced_dictionaries.py
index e35c9a7..889ffe9 100644
--- a/core/enhanced_dictionaries.py
+++ b/core/enhanced_dictionaries.py
@@ -174,6 +174,26 @@ physics_names: Dict[str, List[str]] = {
     "breast_tip": ["胸先", "むねさき", "ブレストティップ", "breasttip"],
 }
 
+# MMD bone name patterns (for detection)
+mmd_bone_patterns: List[str] = [
+    # Japanese bone names
+    '全ての親', 'センター', '上半身', '下半身', '首', '頭',
+    '右腕', '左腕', '右ひじ', '左ひじ', '右手首', '左手首',
+    '右足', '左足', '右ひざ', '左ひざ', '右足首', '左足首',
+    '両目', '左目', '右目', '右肩', '左肩',
+    # English bone names (common in MMD exports)
+    'center', 'groove', 'waist', 'upperbody', 'upperbody2', 'lowerbody',
+    'neck', 'head',
+    'shoulder_r', 'shoulder_l', 'arm_r', 'arm_l',
+    'elbow_r', 'elbow_l', 'wrist_r', 'wrist_l',
+    'leg_r', 'leg_l', 'knee_r', 'knee_l',
+    'ankle_r', 'ankle_l', 'toe_r', 'toe_l',
+    # Mixed/Romanized patterns
+    '센터', 'グルーブ', 'ウエスト',
+    # Common MMD suffixes
+    '_r', '_l', '.r', '.l'
+]
+
 # Create reverse lookup dictionaries
 reverse_shapekey_lookup: Dict[str, str] = {}
 reverse_material_lookup: Dict[str, str] = {}
diff --git a/core/mmd_converter.py b/core/mmd_converter.py
new file mode 100644
index 0000000..d260097
--- /dev/null
+++ b/core/mmd_converter.py
@@ -0,0 +1,166 @@
+"""
+MMD Converter - Core conversion logic for MMD models
+Handles armature hierarchy and naming conventions
+"""
+import bpy
+from typing import Dict, List, Optional, Tuple, Set
+from bpy.types import Object, Bone, Collection
+from .common import get_active_armature
+from .dictionaries import simplify_bonename
+from .enhanced_dictionaries import mmd_bone_patterns
+from .logging_setup import logger
+from .translations import t
+
+
+def detect_mmd_armature(armature: Object) -> bool:
+    """Detect if armature uses MMD bone naming conventions"""
+
+    if not armature or armature.type != 'ARMATURE':
+        return False
+    
+    found_mmd_bones = 0
+    for bone in armature.data.bones:
+        bone_name_lower = bone.name.lower()
+        if any(pattern.lower() in bone_name_lower for pattern in mmd_bone_patterns):
+            found_mmd_bones += 1
+            logger.debug(f"Found MMD bone: {bone.name}")
+    
+    # Consider it MMD if we find at least 5 MMD bones
+    logger.debug(f"Found {found_mmd_bones} MMD bones in armature {armature.name}")
+    return found_mmd_bones >= 5
+
+
+def get_armature_parent_object(armature: Object) -> Optional[Object]:
+    """Get the parent object of the armature (typically an Empty in MMD imports)"""
+    if armature and armature.parent:
+        return armature.parent
+    return None
+
+
+def make_armature_main_parent(armature: Object) -> Tuple[bool, str]:
+    """Make the armature the main parent object by removing any parent empties
+    and reparenting all children to the armature."""
+
+    if not armature or armature.type != 'ARMATURE':
+        return False, t("MMD.error.invalid_armature")
+    
+    logger.info(f"Making armature '{armature.name}' the main parent")
+    
+    # Store original parent
+    original_parent = armature.parent
+    
+    if not original_parent:
+        logger.info("Armature already has no parent")
+        return True, t("MMD.armature_already_root")
+    
+    parent_name = original_parent.name
+    parent_type = original_parent.type
+    
+    logger.info(f"Found parent: {parent_name} (type: {parent_type})")
+    
+    # Get all children of the parent
+    siblings = [child for child in original_parent.children if child != armature]
+
+    armature.parent = None
+    
+    # Reparent siblings to the armature
+    reparented_count = 0
+    for sibling in siblings:
+        sibling.parent = armature
+        reparented_count += 1
+        logger.debug(f"Reparented {sibling.name} to armature")
+    
+    # If the parent was an Empty and now has no children, remove it
+    if parent_type == 'EMPTY' and len(original_parent.children) == 0:
+        try:
+            bpy.data.objects.remove(original_parent, do_unlink=True)
+            logger.info(f"Removed empty parent object: {parent_name}")
+            message = t("MMD.parent_removed_and_reparented", 
+                       parent_name=parent_name, 
+                       count=reparented_count)
+        except Exception as e:
+            logger.warning(f"Could not remove parent empty: {str(e)}")
+            message = t("MMD.parent_unlinked_and_reparented",
+                       parent_name=parent_name,
+                       count=reparented_count)
+    else:
+        message = t("MMD.parent_unlinked", parent_name=parent_name)
+    
+    logger.info(f"Successfully made armature the main parent. Reparented {reparented_count} objects")
+    return True, message
+
+
+def rename_armature_to_standard(armature: Object) -> Tuple[bool, str]:
+    """Rename the armature object to 'Armature' (standard Blender convention)"""
+    if not armature or armature.type != 'ARMATURE':
+        return False, t("MMD.error.invalid_armature")
+    
+    old_name = armature.name
+    
+    # Check if already named 'Armature'
+    if old_name == 'Armature':
+        logger.info("Armature already named 'Armature'")
+        return True, t("MMD.armature_already_named")
+    
+    logger.info(f"Renaming armature from '{old_name}' to 'Armature'")
+    
+    try:
+        armature.name = 'Armature'
+        # Blender might append .001 if name exists, check actual result (Wonder if needed)
+        actual_name = armature.name
+        
+        if actual_name == 'Armature':
+            message = t("MMD.armature_renamed", old_name=old_name, new_name='Armature')
+        else:
+            message = t("MMD.armature_renamed_with_suffix", 
+                       old_name=old_name, 
+                       new_name=actual_name)
+            logger.warning(f"Name collision, armature named: {actual_name}")
+        
+        logger.info(f"Successfully renamed armature to: {actual_name}")
+        return True, message
+        
+    except Exception as e:
+        logger.error(f"Failed to rename armature: {str(e)}")
+        return False, t("MMD.error.rename_failed", error=str(e))
+
+
+def convert_mmd_armature(armature: Object, 
+                        make_parent: bool = True, 
+                        rename_armature: bool = True) -> Tuple[bool, List[str]]:
+    """Convert MMD armature to standard Blender format"""
+    if not armature or armature.type != 'ARMATURE':
+        return False, [t("MMD.error.invalid_armature")]
+    
+    logger.info(f"Starting MMD armature conversion for: {armature.name}")
+    
+    # Check if this is an MMD armature
+    if not detect_mmd_armature(armature):
+        return False, [t("MMD.error.not_mmd_armature")]
+    
+    messages = []
+    overall_success = True
+    
+    # Step 1: Make armature the main parent
+    if make_parent:
+        success, message = make_armature_main_parent(armature)
+        messages.append(message)
+        if not success:
+            overall_success = False
+            logger.warning("Failed to make armature main parent")
+    
+    # Step 2: Rename armature
+    if rename_armature:
+        success, message = rename_armature_to_standard(armature)
+        messages.append(message)
+        if not success:
+            overall_success = False
+            logger.warning("Failed to rename armature")
+    
+    if overall_success:
+        logger.info("MMD armature conversion completed successfully")
+        messages.append(t("MMD.conversion_complete"))
+    else:
+        logger.warning("MMD armature conversion completed with errors")
+    
+    return overall_success, messages
diff --git a/core/properties.py b/core/properties.py
index 7c14f56..5c9dbab 100644
--- a/core/properties.py
+++ b/core/properties.py
@@ -703,6 +703,19 @@ class AvatarToolkitSceneProperties(PropertyGroup):
         default=True
     )
 
+    # MMD Conversion Properties
+    mmd_make_parent: BoolProperty(
+        name=t("MMD.make_armature_parent"),
+        description="Remove parent Empty object and make armature the main parent",
+        default=True
+    )
+    
+    mmd_rename_armature: BoolProperty(
+        name=t("MMD.rename_to_armature"),
+        description="Rename the armature object to 'Armature'",
+        default=True
+    )
+
     # Translation System Properties
     translation_service: EnumProperty(
         name=t("Translation.service"),
diff --git a/functions/tools/mmd_conversion.py b/functions/tools/mmd_conversion.py
new file mode 100644
index 0000000..0f238d6
--- /dev/null
+++ b/functions/tools/mmd_conversion.py
@@ -0,0 +1,58 @@
+"""
+MMD Conversion Operator
+Converts MMD armatures to standard Blender format
+"""
+import bpy
+from bpy.types import Operator
+from ...core.common import get_active_armature
+from ...core.translations import t
+from ...core.mmd_converter import convert_mmd_armature, detect_mmd_armature
+from ...core.logging_setup import logger
+
+
+class AvatarToolkit_OT_ConvertMMDArmature(Operator):
+    """Convert MMD armature to standard Blender format"""
+    bl_idname = "avatar_toolkit.convert_mmd_armature"
+    bl_label = t("MMD.convert_armature.label")
+    bl_description = t("MMD.convert_armature.desc")
+    bl_options = {'REGISTER', 'UNDO'}
+    
+    @classmethod
+    def poll(cls, context):
+        armature = get_active_armature(context)
+        return armature is not None
+    
+    def execute(self, context):
+        armature = get_active_armature(context)
+        if not armature:
+            logger.warning("No active armature found for MMD conversion")
+            self.report({'ERROR'}, t("MMD.no_armature_selected"))
+            return {'CANCELLED'}
+        
+        logger.info(f"Starting MMD conversion for armature: {armature.name}")
+        
+        # Check if it's an MMD armature
+        if not detect_mmd_armature(armature):
+            logger.warning(f"Armature '{armature.name}' does not appear to be an MMD armature")
+            self.report({'WARNING'}, t("MMD.not_mmd_armature"))
+            return {'CANCELLED'}
+        
+        # conversion settings
+        toolkit = context.scene.avatar_toolkit
+        make_parent = toolkit.mmd_make_parent
+        rename_armature = toolkit.mmd_rename_armature
+        
+        logger.info(f"Conversion settings - Make parent: {make_parent}, Rename: {rename_armature}")
+        success, messages = convert_mmd_armature(armature, make_parent, rename_armature)
+        
+        if not success:
+            logger.warning(f"MMD conversion failed: {messages}")
+            for msg in messages:
+                self.report({'WARNING'}, msg)
+            return {'CANCELLED'}
+        
+        logger.info(f"MMD conversion completed successfully")
+        for msg in messages:
+            self.report({'INFO'}, msg)
+        
+        return {'FINISHED'}
diff --git a/resources/translations/en_US.json b/resources/translations/en_US.json
index bcb8ec5..80a1f3b 100644
--- a/resources/translations/en_US.json
+++ b/resources/translations/en_US.json
@@ -601,6 +601,39 @@
     "VRM.remove_root": "Remove Root Bone", 
     "VRM.remove_root_desc": "Remove unnecessary VRM root bone and make Hips the root bone",
 
+    "MMD.panel.label": "MMD Converter",
+    "MMD.converter.title": "MMD Armature Converter",
+    "MMD.no_armature_selected": "No armature selected",
+    "MMD.select_armature_to_convert": "Select an armature to convert",
+    "MMD.armature_name": "Armature: {name}",
+    "MMD.armature_detected": "MMD armature detected",
+    "MMD.no_mmd_bones_detected": "No MMD bones detected",
+    "MMD.not_mmd_armature": "Selected armature does not appear to be MMD format",
+    "MMD.make_armature_parent": "Make Armature Main Parent",
+    "MMD.rename_to_armature": "Rename to 'Armature'",
+    "MMD.convert_armature_button": "Convert MMD Armature",
+    "MMD.convert_armature.label": "Convert MMD Armature",
+    "MMD.convert_armature.desc": "Convert MMD armature to standard Blender format",
+    "MMD.conversion_info.title": "Conversion Info:",
+    "MMD.conversion_info.removes_parent": "• Removes parent Empty object",
+    "MMD.conversion_info.renames_armature": "• Renames armature to 'Armature'",
+    "MMD.conversion_info.maintains_hierarchy": "• Maintains object hierarchy",
+    "MMD.detection_failed.title": "MMD Detection Failed:",
+    "MMD.detection_failed.not_mmd_format": "• Selected armature is not MMD format",
+    "MMD.detection_failed.need_mmd_bones": "• Need at least 5 MMD bones detected",
+    "MMD.detection_failed.check_bone_names": "• Check armature bone names",
+    "MMD.error.invalid_armature": "Invalid armature object",
+    "MMD.error.not_mmd_armature": "Armature does not appear to be MMD format",
+    "MMD.error.rename_failed": "Failed to rename armature: {error}",
+    "MMD.armature_already_root": "Armature already has no parent",
+    "MMD.armature_already_named": "Armature is already named 'Armature'",
+    "MMD.parent_removed_and_reparented": "Removed parent '{parent_name}' and reparented {count} objects to armature",
+    "MMD.parent_unlinked_and_reparented": "Unlinked from parent '{parent_name}' and reparented {count} objects",
+    "MMD.parent_unlinked": "Unlinked armature from parent '{parent_name}'",
+    "MMD.armature_renamed": "Renamed armature from '{old_name}' to '{new_name}'",
+    "MMD.armature_renamed_with_suffix": "Renamed armature from '{old_name}' to '{new_name}' (name collision)",
+    "MMD.conversion_complete": "MMD armature conversion completed successfully",
+
     "Translation.label": "Translation",
     "Translation.service": "Translation Service",
     "Translation.service_desc": "Choose the translation service to use",
diff --git a/ui/mmd_panel.py b/ui/mmd_panel.py
new file mode 100644
index 0000000..39baf4f
--- /dev/null
+++ b/ui/mmd_panel.py
@@ -0,0 +1,87 @@
+"""
+MMD Converter Panel - UI for MMD conversion tools
+"""
+import bpy
+from bpy.types import Panel, Context, UILayout
+from .main_panel import AvatarToolKit_PT_AvatarToolkitPanel, CATEGORY_NAME
+from .panel_layout import get_panel_order, should_open_by_default
+from ..core.translations import t
+from ..core.common import get_active_armature
+from ..core.mmd_converter import detect_mmd_armature
+from ..functions.tools.mmd_conversion import AvatarToolkit_OT_ConvertMMDArmature
+
+
+class AvatarToolKit_PT_MMDPanel(Panel):
+    """Panel for MMD conversion tools"""
+    bl_label = t("MMD.panel.label")
+    bl_idname = "OBJECT_PT_avatar_toolkit_mmd"
+    bl_space_type = 'VIEW_3D'
+    bl_region_type = 'UI'
+    bl_category = CATEGORY_NAME
+    bl_parent_id = AvatarToolKit_PT_AvatarToolkitPanel.bl_idname
+    bl_order = get_panel_order('mmd')
+    bl_options = set() if not should_open_by_default('MMD') else {'DEFAULT_CLOSED'}
+
+    def draw(self, context: Context) -> None:
+        """Draw the MMD conversion panel interface"""
+        layout: UILayout = self.layout
+        
+        # MMD Conversion Tools
+        mmd_box: UILayout = layout.box()
+        col: UILayout = mmd_box.column(align=True)
+        col.label(text=t("MMD.converter.title"), icon='ARMATURE_DATA')
+        col.separator(factor=0.5)
+        
+        # Check if we have an active armature
+        armature = get_active_armature(context)
+        
+        if not armature:
+            col.label(text=t("MMD.no_armature_selected"), icon='ERROR')
+            col.label(text=t("MMD.select_armature_to_convert"))
+            return
+        
+        # Check if the armature appears to be MMD
+        is_mmd = detect_mmd_armature(armature)
+        
+        if is_mmd:
+            col.label(text=t("MMD.armature_name", name=armature.name), icon='CHECKMARK')
+            col.label(text=t("MMD.armature_detected"), icon='INFO')
+            col.separator(factor=0.3)
+            
+            toolkit = context.scene.avatar_toolkit
+            col.prop(toolkit, 'mmd_make_parent', text=t("MMD.make_armature_parent"))
+            col.prop(toolkit, 'mmd_rename_armature', text=t("MMD.rename_to_armature"))
+            col.separator(factor=0.2)
+            
+            col.operator(
+                AvatarToolkit_OT_ConvertMMDArmature.bl_idname,
+                text=t("MMD.convert_armature_button"),
+                icon='EXPORT'
+            )
+            
+            info_box = mmd_box.box()
+            info_col = info_box.column(align=True)
+            info_col.label(text=t("MMD.conversion_info.title"), icon='INFO')
+            info_col.label(text=t("MMD.conversion_info.removes_parent"))
+            info_col.label(text=t("MMD.conversion_info.renames_armature"))
+            info_col.label(text=t("MMD.conversion_info.maintains_hierarchy"))
+            
+        else:
+            col.label(text=t("MMD.armature_name", name=armature.name), icon='ERROR')
+            col.label(text=t("MMD.no_mmd_bones_detected"), icon='CANCEL')
+            col.separator(factor=0.3)
+            
+            row = col.row()
+            row.enabled = False
+            row.operator(
+                AvatarToolkit_OT_ConvertMMDArmature.bl_idname,
+                text=t("MMD.convert_armature_button"),
+                icon='CANCEL'
+            )
+            
+            help_box = mmd_box.box()
+            help_col = help_box.column(align=True)
+            help_col.label(text=t("MMD.detection_failed.title"), icon='QUESTION')
+            help_col.label(text=t("MMD.detection_failed.not_mmd_format"))
+            help_col.label(text=t("MMD.detection_failed.need_mmd_bones"))
+            help_col.label(text=t("MMD.detection_failed.check_bone_names"))
diff --git a/ui/panel_layout.py b/ui/panel_layout.py
index 90ccc32..b6e36cf 100644
--- a/ui/panel_layout.py
+++ b/ui/panel_layout.py
@@ -14,7 +14,8 @@ VISEMES_ORDER = 6
 EYE_TRACKING_ORDER = 7
 TEXTURE_ATLAS_ORDER = 8
 VRM_UNITY_ORDER = 9
-SETTINGS_ORDER = 10
+MMD_ORDER = 10
+SETTINGS_ORDER = 11
 
 # Panel open/closed by default
 PANELS_OPEN_BY_DEFAULT = {
@@ -27,6 +28,7 @@ PANELS_OPEN_BY_DEFAULT = {
     'EYE_TRACKING': True,   
     'TEXTURE_ATLAS': True,  
     'VRM_UNITY': True,      
+    'MMD': True,            
     'SETTINGS': True,       
     'TRANSLATION': True,   
 }
@@ -44,6 +46,7 @@ def get_panel_order(panel_name: str) -> int:
         'eye_tracking': EYE_TRACKING_ORDER,
         'texture_atlas': TEXTURE_ATLAS_ORDER,
         'vrm_unity': VRM_UNITY_ORDER,
+        'mmd': MMD_ORDER,
         'settings': SETTINGS_ORDER,
     }
     return order_map.get(panel_name.lower(), 99)