diff --git a/Scripts/LookAt/CurveMapper.cs b/Scripts/LookAt/CurveMapper.cs
index a3ea04107..2695b51da 100644
--- a/Scripts/LookAt/CurveMapper.cs
+++ b/Scripts/LookAt/CurveMapper.cs
@@ -12,10 +12,22 @@ namespace VRM
         public AnimationCurve Curve = AnimationCurve.Linear(0, 0, 1.0f, 1.0f);
 
         [Range(20.0f, 90.0f)]
-        public float CurveXRangeDegree = 90.0f;
+        public float CurveXRangeDegree;
 
         [Range(0, 90.0f)]
-        public float CurveYRangeDegree = 10.0f;
+        public float CurveYRangeDegree;
+
+        /*
+        public CurveMapper() : this(90.0f, 10.0f)
+        {
+        }
+        */
+
+        public CurveMapper(float xRange, float yRange)
+        {
+            CurveXRangeDegree = xRange;
+            CurveYRangeDegree = yRange;
+        }
 
         public void OnValidate()
         {
diff --git a/Scripts/LookAt/VRMLookAt.cs b/Scripts/LookAt/VRMLookAt.cs
index 79cf6b6fa..8b8bda230 100644
--- a/Scripts/LookAt/VRMLookAt.cs
+++ b/Scripts/LookAt/VRMLookAt.cs
@@ -28,16 +28,16 @@ namespace VRM
         public OffsetOnTransform Head;
 
         [SerializeField, Header("Degree Mapping")]
-        public CurveMapper HorizontalOuter = new CurveMapper();
+        public CurveMapper HorizontalOuter = new CurveMapper(90.0f, 10.0f);
 
         [SerializeField]
-        public CurveMapper HorizontalInner = new CurveMapper();
+        public CurveMapper HorizontalInner = new CurveMapper(90.0f, 10.0f);
 
         [SerializeField]
-        public CurveMapper VerticalDown = new CurveMapper();
+        public CurveMapper VerticalDown = new CurveMapper(90.0f, 10.0f);
 
         [SerializeField]
-        public CurveMapper VerticalUp = new CurveMapper();
+        public CurveMapper VerticalUp = new CurveMapper(90.0f, 10.0f);
 
         public Texture2D CreateThumbnail()
         {
diff --git a/Scripts/LookAt/VRMLookAtBlendShapeApplyer.cs b/Scripts/LookAt/VRMLookAtBlendShapeApplyer.cs
index afcef38b8..be90dba13 100644
--- a/Scripts/LookAt/VRMLookAtBlendShapeApplyer.cs
+++ b/Scripts/LookAt/VRMLookAtBlendShapeApplyer.cs
@@ -9,13 +9,13 @@ namespace VRM
         public bool DrawGizmo = true;
 
         [SerializeField, Header("Degree Mapping")]
-        public CurveMapper Horizontal = new CurveMapper();
+        public CurveMapper Horizontal = new CurveMapper(90.0f, 1.0f);
 
         [SerializeField]
-        public CurveMapper VerticalDown = new CurveMapper();
+        public CurveMapper VerticalDown = new CurveMapper(90.0f, 1.0f);
 
         [SerializeField]
-        public CurveMapper VerticalUp = new CurveMapper();
+        public CurveMapper VerticalUp = new CurveMapper(90.0f, 1.0f);
 
         VRMLookAtHead m_head;
         VRMBlendShapeProxy m_propxy;
diff --git a/Scripts/LookAt/VRMLookAtBoneApplyer.cs b/Scripts/LookAt/VRMLookAtBoneApplyer.cs
index 152e648db..b34f5eb5d 100644
--- a/Scripts/LookAt/VRMLookAtBoneApplyer.cs
+++ b/Scripts/LookAt/VRMLookAtBoneApplyer.cs
@@ -16,16 +16,16 @@ namespace VRM
         public OffsetOnTransform RightEye;
 
         [SerializeField, Header("Degree Mapping")]
-        public CurveMapper HorizontalOuter = new CurveMapper();
+        public CurveMapper HorizontalOuter = new CurveMapper(90.0f, 10.0f);
 
         [SerializeField]
-        public CurveMapper HorizontalInner = new CurveMapper();
+        public CurveMapper HorizontalInner = new CurveMapper(90.0f, 10.0f);
 
         [SerializeField]
-        public CurveMapper VerticalDown = new CurveMapper();
+        public CurveMapper VerticalDown = new CurveMapper(90.0f, 10.0f);
 
         [SerializeField]
-        public CurveMapper VerticalUp = new CurveMapper();
+        public CurveMapper VerticalUp = new CurveMapper(90.0f, 10.0f);
 
         private void Reset()
         {