diff --git a/app/src/main/java/com/google/ar/core/examples/java/common/framework/physics/BoundingBoxVisitor.java b/app/src/main/java/com/google/ar/core/examples/java/common/framework/physics/BoundingBoxVisitor.java
index 371ab9f..91feb2b 100644
--- a/app/src/main/java/com/google/ar/core/examples/java/common/framework/physics/BoundingBoxVisitor.java
+++ b/app/src/main/java/com/google/ar/core/examples/java/common/framework/physics/BoundingBoxVisitor.java
@@ -13,15 +13,15 @@
 	private ArrayList<BoundingSphere> bsStack = new ArrayList<BoundingSphere>();	// オブジェクトの階層毎のBoundingSphereのスタック
 	private String partName = null;	// 部品を指定する場合に使う
 	private boolean inPart = false;
-	
+
 	public BoundingBoxVisitor() {
 		partName = null;
 	}
-	
+
 	public BoundingBoxVisitor(String partName) {
 		this.partName = partName;
 	}
-	
+
 	public void preVisit(Object3D obj) {
 		pushTransform(obj);
 		if (partName != null && obj.name.equals(partName)) {
@@ -42,12 +42,12 @@
 				if (obj.bs == null) {
 					obj.bs = obb.getBoundingSphere();
 				}
-	
+
 				obb = (OBB)obb.clone();
 				BoundingSphere bs = (BoundingSphere)obj.bs.clone();
 				for (int i = stackList.size() - 1; i >= 0; i--) {
 					obb.transform(stackList.get(i));
-					bs.transform(stackList.get(i));
+					if (i >= stackList.size() - 4) bs.transform(stackList.get(i));
 				}
 				if (partName == null || partName.length() == 0 || inPart) {
 					obbList.add(obb); // Transform3Dを適応させたBoundsをboundsListに追加
@@ -72,12 +72,16 @@
 				stackTop--;
 			}
 			if (obj.bs != null && stackTop >= 0) {
+				BoundingSphere bs = (BoundingSphere)obj.bs.clone();
+				for (int i = stackList.size() - 1; i >= stackList.size() - 4; i--) {
+					bs.transform(stackList.get(i));
+				}
 				if (bsStack.get(stackTop) == null) {
 					// その階層の最初のオブジェクトの場合、nullを置き換え
-					bsStack.set(stackTop, obj.bs);
+					bsStack.set(stackTop, bs);
 				} else {
 					// その階層の2番目以降のオブジェクトの場合、結合
-					bsStack.get(stackTop).combine(obj.bs);
+					bsStack.get(stackTop).combine(bs);
 				}
 			}
 		}