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凹部を有する先端工具を収納するフロントカバーと、該フロントカバーに設けられた貫通孔に先端工具の軸方向に移動可能かつ径方向に移動可能に配設され、前記フロントカバー内部に突出して前記先端工具の凹部と係合可能な錠止部材と、該錠止部材の前記径方向移動を規制及び解除し、前記規制時には前記錠止部材を前記フロントカバー内部に突出させるホルダと、該ホルダによって前記錠止部材が前記フロントカバー内部に突出される位置に位置するように前記錠止部材を付勢する付勢手段とを有する衝撃工具の工具保持装置であって、前記付勢手段と前記錠止部材との間に位置し、前記付勢手段の付勢力を受ける円環部材を設けると共に、該円環部材に前記先端工具の半径方向に延びる穴部を設け、該穴部に取付けられ前記貫通孔内に位置し前記錠止部材と接触可能なプレートを設けたことを特徴とする衝撃工具。A front cover that houses a tip tool having a recess, and is disposed in a through-hole provided in the front cover so as to be movable in the axial direction and radially of the tip tool, and protrudes into the front cover to project the tip A locking member that can be engaged with a recess of a tool, a holder that restricts and releases the radial movement of the locking member, and causes the locking member to protrude into the front cover at the time of the restriction; An impact tool tool holding device having biasing means for biasing the locking member so that the locking member is located at a position where the locking member protrudes into the front cover, the biasing means and the locking device An annular member positioned between the member and receiving the urging force of the urging means is provided, and a hole extending in the radial direction of the tip tool is provided in the annular member, and the penetrating hole is attached to the hole. In the hole Position to an impact tool characterized in that a possible contact plate and the locking member. 前記錠止部材及び前記穴部、前記プレートを複数個設けたことを特徴とする請求項１記載の衝撃工具。The impact tool according to claim 1, wherein a plurality of the locking member, the hole, and the plate are provided . 前記錠止部材及び前記穴部、前記プレートを少なくとも３個以上設けたことを特徴とする請求項１、請求項２記載の衝撃工具。The impact tool according to claim 1, wherein at least three of the locking member, the hole, and the plate are provided. 前記円環部材外周に前記プレートの外周上に位置する抜止め部材を設けたことを特徴とする請求項１〜請求項３のいずれか１項の衝撃工具。The impact tool according to any one of claims 1 to 3, wherein a retaining member located on the outer periphery of the plate is provided on the outer periphery of the annular member . 前記付勢手段は、前記円環部材を付勢する第１の付勢手段と、前記ホルダを付勢する第２の付勢手段を有することを特徴とする請求項１〜請求項４のいずれか１項記載の衝撃工具。The said urging means has the 1st urging means which urges | biases the said annular member, and the 2nd urging means which urges | biases the said holder, Any one of Claims 1-4 characterized by the above-mentioned. The impact tool according to claim 1 . 前記抜止め部材は、前記ホルダと前記第２の付勢手段との間に位置し、前記第２の付勢手段の付勢力を前記ホルダに伝達するスリーブであることを特徴とする請求項５記載の衝撃工具。The said retaining member is a sleeve which is located between the said holder and the said 2nd biasing means, and transmits the biasing force of the said 2nd biasing means to the said holder. The listed impact tool. 前記円環部材の前記穴部内及び前記プレートに互いに当接する段差を設けたことを特徴とする請求項１〜請求項６のいずれか１項記載の衝撃工具。The impact tool according to any one of claims 1 to 6, wherein a step is provided in the hole portion of the annular member and the plate to contact each other .