diff --git a/src/org/ntlab/deltaExtractor/DeltaExtractor.java b/src/org/ntlab/deltaExtractor/DeltaExtractor.java
index 11dd99a..36291dd 100644
--- a/src/org/ntlab/deltaExtractor/DeltaExtractor.java
+++ b/src/org/ntlab/deltaExtractor/DeltaExtractor.java
@@ -149,6 +149,16 @@
 			}
 		}
 		
+		if (childMethodExecution != null && childMethodExecution.isStatic() && objList.contains(null)) {
+			// static�ȌĂяo�����this�Ɉˑ�����
+			removeList.add(thisObjectId);		// ��ň�U�AthisObject ����菜��
+			isTrackingThis = true;				// �Ăяo�����T���O�ɕ���
+			if (methodExecution.isStatic()) {
+				// �Ăяo������static�̏ꍇ
+				aliasCollector.addAlias(new Alias(Alias.AliasType.THIS, 0, methodExecution.getThisObjId(), tracePoint.duplicate()));		// static�Ăяo�����G�C���A�X�Ƃ��ċL�^����
+			}
+		}
+		
 		if (childMethodExecution != null) {
 			for (String objId : objList) {
 				if (!objId.equals(childMethodExecution.getThisObjId())) {
@@ -765,7 +775,7 @@
 								aliasCollector.changeTrackingObject(objectId, thisObjectId, false);
 								aliasCollector.addAlias(new Alias(Alias.AliasType.THIS, 0, thisObjectId, tracePoint.duplicate()));
 							}
-							if (Trace.isNull(thisObjectId)) objectId = null;	// static�ϐ��̏ꍇ
+							if (Trace.isNull(thisObjectId)) objectId = null;	// �Ăяo������static�̏ꍇ
 							else objectId = thisObjectId;
 							objList.set(index, objectId);
 							isResolved = true;
@@ -774,9 +784,10 @@
 						}
 						objectId = objList.get(index);
 						if (objectId == null) {
-							// static�Ăяo���̖߂�l�������ꍇ�i���Ԃ�j
+							// static�Ăяo���̖߂�l�������ꍇ
 							trackingObj = null;
 							isResolved = true;
+							aliasCollector.addAlias(new Alias(Alias.AliasType.THIS, 0, thisObjectId, tracePoint.duplicate()));		// static�Ăяo�����G�C���A�X�Ƃ��ċL�^���� 
 						} else if (objectId.equals(srcObject.getId())) {
 							trackingObj = srcObject;
 						} else if (objectId.equals(dstObject.getId())) {
@@ -935,8 +946,8 @@
 			}
 		}
 		
-		if (objectId == null && isResolved && !isStatic) {	// static �Ăяo������̖߂�l��Ԃ��Ă���ꍇ
-			objList.set(index, thisObjectId);	// ������ǐՂ�����
+		if (objectId == null && isResolved && !isStatic) {	// static�ȌĂяo���悩��̖߂�l��ǐՂ������ʁA�Ăяo�����this�Ɉˑ��������A�������g��static�łȂ��ꍇ
+			objList.set(index, thisObjectId);	// this�̒ǐՂ𕜊�������
 			if (Trace.isNull(srcObject.getId())) {
 				srcObject = thisObj;
 			} else if (Trace.isNull(dstObject.getId())) {