diff --git a/Assets/VRM10/Runtime/Components/Constraint/Vrm10ConstraintUtil.cs b/Assets/VRM10/Runtime/Components/Constraint/Vrm10ConstraintUtil.cs
new file mode 100644
index 000000000..702f17d02
--- /dev/null
+++ b/Assets/VRM10/Runtime/Components/Constraint/Vrm10ConstraintUtil.cs
@@ -0,0 +1,18 @@
+namespace UniVRM10
+{
+    public static class Vrm10ConstraintUtil
+    {
+        /// <summary>
+        /// 右手系と左手系を相互に変換する
+        /// </summary>
+        public static UniGLTF.Extensions.VRMC_node_constraint.AimAxis ReverseX(UniGLTF.Extensions.VRMC_node_constraint.AimAxis src)
+        {
+            switch (src)
+            {
+                case UniGLTF.Extensions.VRMC_node_constraint.AimAxis.PositiveX: return UniGLTF.Extensions.VRMC_node_constraint.AimAxis.NegativeX;
+                case UniGLTF.Extensions.VRMC_node_constraint.AimAxis.NegativeX: return UniGLTF.Extensions.VRMC_node_constraint.AimAxis.PositiveX;
+                default: return src;
+            }
+        }
+    }
+}
diff --git a/Assets/VRM10/Runtime/Components/Constraint/Vrm10ConstraintUtil.cs.meta b/Assets/VRM10/Runtime/Components/Constraint/Vrm10ConstraintUtil.cs.meta
new file mode 100644
index 000000000..461a75070
--- /dev/null
+++ b/Assets/VRM10/Runtime/Components/Constraint/Vrm10ConstraintUtil.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: e2c7b76ebe42e9543ac52153ea9f2728
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
index af3dc02f4..bd20f8cb4 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Exporter.cs
@@ -430,7 +430,7 @@ namespace UniVRM10
                         {
                             Source = model.Nodes.IndexOf(converter.Nodes[aimConstraint.Source.gameObject]),
                             Weight = aimConstraint.Weight,
-                            AimAxis = aimConstraint.AimAxis,
+                            AimAxis = Vrm10ConstraintUtil.ReverseX(aimConstraint.AimAxis),
                         };
                         break;
 
diff --git a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
index 1fab7d277..6aed057d5 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
@@ -701,7 +701,7 @@ namespace UniVRM10
                         var component = node.gameObject.AddComponent<Vrm10AimConstraint>();
                         component.Source = Nodes[aim.Source.Value]; // required
                         component.Weight = aim.Weight.GetValueOrDefault(1.0f);
-                        component.AimAxis = aim.AimAxis; // required
+                        component.AimAxis = Vrm10ConstraintUtil.ReverseX(aim.AimAxis); // required
                     }
                     else if (constraint.Rotation != null)
                     {