diff --git a/Assets/Thread.prefab b/Assets/Thread.prefab
index 9a57f59..4054754 100644
--- a/Assets/Thread.prefab
+++ b/Assets/Thread.prefab
@@ -29,7 +29,7 @@ Transform:
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   m_LocalPosition: {x: 83.62, y: -8.22, z: -7.05}
-  m_LocalScale: {x: 7, y: 7, z: 7}
+  m_LocalScale: {x: 12, y: 12, z: 12}
   m_ConstrainProportionsScale: 0
   m_Children: []
   m_Father: {fileID: 0}
diff --git a/Assets/_Scenes/BossStage.unity b/Assets/_Scenes/BossStage.unity
index 212bca8..be55244 100644
--- a/Assets/_Scenes/BossStage.unity
+++ b/Assets/_Scenes/BossStage.unity
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       propertyPath: m_LocalPosition.x
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+      value: 80.55
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       propertyPath: m_LocalPosition.z
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+      value: 25.76
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       propertyPath: m_LocalRotation.w
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+      value: 62.18
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   ceilingAnchor: {fileID: 1626958826}
   groundAnchor: {fileID: 1519524653}
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+  <AttackRadius>k__BackingField: 30
   <JumpRoarDuration>k__BackingField: 5
   <CeilingAttackDuration>k__BackingField: 8
   <CeilingShotInterval>k__BackingField: 0.2
   <WebWarningDelay>k__BackingField: 0.8
-  <WebDuration>k__BackingField: 3
+  <WebDuration>k__BackingField: 10
+  <WebAvoidanceRadius>k__BackingField: 2.5
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+      value: 21.1
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       value: rock4 (13)
       objectReference: {fileID: 0}
+    - target: {fileID: 100000, guid: 84376f2a0948947b5a6dfe814a1100a0, type: 3}
+      propertyPath: m_IsActive
+      value: 1
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       propertyPath: m_LocalScale.x
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       value: rock4 (11)
       objectReference: {fileID: 0}
+    - target: {fileID: 100000, guid: 84376f2a0948947b5a6dfe814a1100a0, type: 3}
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     - target: {fileID: 1077043634566485173, guid: cb54601bec56a2c47b6032cdacd32e60, type: 3}
       propertyPath: m_LocalEulerAnglesHint.z
-      value: 0
+      value: 6.913
       objectReference: {fileID: 0}
     - target: {fileID: 1458160364811997277, guid: cb54601bec56a2c47b6032cdacd32e60, type: 3}
       propertyPath: m_Name
@@ -7323,23 +7332,23 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalScale.x
-      value: 30
+      value: 20
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalScale.y
-      value: 30
+      value: 20
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalScale.z
-      value: 30
+      value: 20
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalPosition.x
-      value: 158.65
+      value: 135.35
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalPosition.y
-      value: 14.12
+      value: 21.11
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalPosition.z
@@ -7347,31 +7356,31 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalRotation.w
-      value: 0.50467855
+      value: 0.39200762
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalRotation.x
-      value: 0.44750485
+      value: 0.54886633
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalRotation.y
-      value: 0.5523846
+      value: 0.4282176
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalRotation.z
-      value: 0.48980644
+      value: 0.6014196
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalEulerAnglesHint.x
-      value: -5.131
+      value: -4.862
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalEulerAnglesHint.y
-      value: 90.62
+      value: 88.231
       objectReference: {fileID: 0}
     - target: {fileID: 8247934736652583955, guid: 1da579bc30f41054eac61ecca254cd6b, type: 3}
       propertyPath: m_LocalEulerAnglesHint.z
-      value: 83.1
+      value: 109.093
       objectReference: {fileID: 0}
     m_RemovedComponents: []
     m_RemovedGameObjects: []
@@ -7409,7 +7418,7 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: 24be8e1643b8a474fbb57fcda8a1c454, type: 3}
       propertyPath: m_LocalPosition.x
-      value: 71.94225
+      value: 68.3
       objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: 24be8e1643b8a474fbb57fcda8a1c454, type: 3}
       propertyPath: m_LocalPosition.y
@@ -7543,6 +7552,10 @@ PrefabInstance:
       propertyPath: m_Name
       value: cliff (9)
       objectReference: {fileID: 0}
+    - target: {fileID: 100000, guid: d9d1fbfcf69364ffd8f9c6ade9ce90fe, type: 3}
+      propertyPath: m_IsActive
+      value: 1
+      objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: d9d1fbfcf69364ffd8f9c6ade9ce90fe, type: 3}
       propertyPath: m_LocalScale.x
       value: 10
@@ -7557,7 +7570,7 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: d9d1fbfcf69364ffd8f9c6ade9ce90fe, type: 3}
       propertyPath: m_LocalPosition.x
-      value: 116.88513
+      value: 100.67
       objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: d9d1fbfcf69364ffd8f9c6ade9ce90fe, type: 3}
       propertyPath: m_LocalPosition.y
@@ -7823,6 +7836,10 @@ PrefabInstance:
       propertyPath: m_Name
       value: rock4 (12)
       objectReference: {fileID: 0}
+    - target: {fileID: 100000, guid: 84376f2a0948947b5a6dfe814a1100a0, type: 3}
+      propertyPath: m_IsActive
+      value: 1
+      objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: 84376f2a0948947b5a6dfe814a1100a0, type: 3}
       propertyPath: m_LocalScale.x
       value: 15
@@ -7845,7 +7862,7 @@ PrefabInstance:
       objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: 84376f2a0948947b5a6dfe814a1100a0, type: 3}
       propertyPath: m_LocalPosition.z
-      value: -86.33522
+      value: -78.35
       objectReference: {fileID: 0}
     - target: {fileID: 400000, guid: 84376f2a0948947b5a6dfe814a1100a0, type: 3}
       propertyPath: m_LocalRotation.w
diff --git a/Assets/_Scenes/BossStage/NavMesh-SM_Building_Floor.asset b/Assets/_Scenes/BossStage/NavMesh-SM_Building_Floor.asset
index ced76df..3bfa0fc 100644
Binary files a/Assets/_Scenes/BossStage/NavMesh-SM_Building_Floor.asset and b/Assets/_Scenes/BossStage/NavMesh-SM_Building_Floor.asset differ
diff --git a/Assets/_Scripts/BossController.cs b/Assets/_Scripts/BossController.cs
index 4332baa..ffa4f78 100644
--- a/Assets/_Scripts/BossController.cs
+++ b/Assets/_Scripts/BossController.cs
@@ -19,18 +19,18 @@ public class BossController : MonoBehaviour, IDamageble
 
     [SerializeField] public Transform ceilingAnchor;
     [SerializeField] public Transform groundAnchor;
-    [field: SerializeField] public float AttackRadius { get; private set; } = 10f;
-    [field: SerializeField] public float JumpRoarDuration { get; private set; } = 5f;
+    [field: SerializeField] public float AttackRadius { get; private set; } = 15f;
+    [field: SerializeField] public float JumpRoarDuration { get; private set; } = 2f;
     [field: SerializeField] public float CeilingAttackDuration { get; private set; } = 8.0f;
-
-    [Tooltip("★新設：糸を降らせる時間間隔（秒）。数値を小さくする（例: 0.1）ほど弾数が激増して密度が上がります")]
     [field: SerializeField] public float CeilingShotInterval { get; private set; } = 0.2f;
-
-    [Tooltip("★新設：地面に赤マーク（予兆）が出てから、本物の糸が降ってくるまでのタイムラグ（秒）")]
     [field: SerializeField] public float WebWarningDelay { get; private set; } = 0.8f;
-
-    [Tooltip("★新設：地面に生成された糸が消えずに残り続ける時間（秒）")]
     [field: SerializeField] public float WebDuration { get; private set; } = 3.0f;
+
+    [Tooltip("★新設：すでに糸がある場所から、最低何メートル離すか（被り防止の半径）")]
+    [field: SerializeField] public float WebAvoidanceRadius { get; private set; } = 2.5f;
+
+    // ★新設：現在ステージ上に存在している（または予兆がある）糸の座標リスト
+    public List<Vector3> ActiveWebPositions { get; private set; } = new List<Vector3>();
     [SerializeField] private GameObject warningMarkerPrefab;
     [SerializeField] private GameObject webPrefab;
 
@@ -163,6 +163,10 @@ public class BossController : MonoBehaviour, IDamageble
 
     private System.Collections.IEnumerator SpawnWebRoutine(Vector3 pos, float delay, float duration)
     {
+        // 1. 生成する座標をアクティブリストに登録（この場所への他の割り込みを禁止する）
+        ActiveWebPositions.Add(pos);
+
+        // 2. 地面に予兆マークを生成
         GameObject marker = null;
         if (warningMarkerPrefab != null)
         {
@@ -172,14 +176,23 @@ public class BossController : MonoBehaviour, IDamageble
         yield return new WaitForSeconds(delay);
         if (marker != null) Destroy(marker);
 
+        // 3. 本物の糸オブジェクトを生成（X軸90度回転）
         if (webPrefab != null)
         {
             Quaternion webRotation = Quaternion.Euler(270f, 0f, 0f);
-
             GameObject web = Instantiate(webPrefab, pos + new Vector3(0, 0.5f, 0), webRotation);
-
-            Destroy(web, duration);
+            
+            // ★持続時間（duration）が終わるまで待機してからDestroyする形に変更
+            yield return new WaitForSeconds(duration);
+            if (web != null) Destroy(web);
         }
+        else
+        {
+            yield return new WaitForSeconds(duration);
+        }
+
+        // 4. 糸が消滅したので、リストから座標を削除してスペースを解放する
+        ActiveWebPositions.Remove(pos);
     }
 
     public void ResetAllAnimationTriggers()
diff --git a/Assets/_Scripts/SpiderIdleState.cs b/Assets/_Scripts/SpiderIdleState.cs
index 18b7eca..51c86cb 100644
--- a/Assets/_Scripts/SpiderIdleState.cs
+++ b/Assets/_Scripts/SpiderIdleState.cs
@@ -265,17 +265,41 @@ public class SpiderCeilingAttackState : SpiderStateBase
         }
     }
 
-    private void ExecuteRandomWebAttack()
+   private void ExecuteRandomWebAttack()
     {
-        // インスペクターで設定された半径（AttackRadius）を基準にランダム座標を計算
-        Vector2 randomCircle = Random.insideUnitCircle * boss.AttackRadius;
-        Vector3 targetGroundPos = new Vector3(
-            boss.groundAnchor.position.x + randomCircle.x,
-            boss.groundAnchor.position.y,
-            boss.groundAnchor.position.z + randomCircle.y
-        );
+        Vector3 targetGroundPos = Vector3.zero;
+        int maxAttempts = 15; // 無限ループ（フリーズ）を防止するための最大再抽選回数
+        
+        for (int i = 0; i < maxAttempts; i++)
+        {
+            // 1. 一旦ランダムな座標を算出
+            Vector2 randomCircle = Random.insideUnitCircle * boss.AttackRadius;
+            targetGroundPos = new Vector3(
+                boss.groundAnchor.position.x + randomCircle.x,
+                boss.groundAnchor.position.y,
+                boss.groundAnchor.position.z + randomCircle.y
+            );
 
-        // ★リファクタリング：予兆マークのディレイや糸の生存時間もインスペクターと完全連動
+            // 2. 現在アクティブなすべての糸との距離を計測する
+            bool isTooClose = false;
+            foreach (Vector3 existingPos in boss.ActiveWebPositions)
+            {
+                // 設定された回避半径（WebAvoidanceRadius）より近い既存の糸があるか？
+                if (Vector3.Distance(targetGroundPos, existingPos) < boss.WebAvoidanceRadius)
+                {
+                    isTooClose = true;
+                    break; // 被り検知、この座標は使えないのでチェックを抜けて再抽選へ
+                }
+            }
+
+            // 3. 誰とも被っていなければ、このクリーンな座標で確定
+            if (!isTooClose)
+            {
+                break;
+            }
+        }
+
+        // 確定した（または上限に達して安全が担保された）座標へ向けて発射命令
         boss.SpawnWarningAndWeb(targetGroundPos, boss.WebWarningDelay, boss.WebDuration);
     }
 }