diff --git a/Assets/VRM10/Runtime/Components/Constraint/Vrm10AimConstraint.cs b/Assets/VRM10/Runtime/Components/Constraint/Vrm10AimConstraint.cs
index 72d364c82..231640f0b 100644
--- a/Assets/VRM10/Runtime/Components/Constraint/Vrm10AimConstraint.cs
+++ b/Assets/VRM10/Runtime/Components/Constraint/Vrm10AimConstraint.cs
@@ -76,5 +76,31 @@ namespace UniVRM10
                 Weight
             );
         }
+
+        public void OnDrawGizmosSelected()
+        {
+            if (Source == null)
+            {
+                return;
+            }
+
+            Gizmos.color = Color.magenta;
+            Gizmos.DrawLine(transform.position, Source.position);
+            Gizmos.DrawSphere(Source.position, 0.01f);
+
+            Gizmos.matrix = transform.localToWorldMatrix;
+            var len = 0.1f;
+            switch (AimAxis)
+            {
+                case AimAxis.PositiveX:
+                    Gizmos.color = Color.red;
+                    Gizmos.DrawLine(Vector3.zero, Vector3.right * len);
+                    break;
+                case AimAxis.NegativeX:
+                    Gizmos.color = Color.red;
+                    Gizmos.DrawLine(Vector3.zero, Vector3.left * len);
+                    break;
+            }
+        }
     }
 }