PROBLEM TO BE SOLVED: To provide a hand piece for an electric knife which is used in surgical operations such as a laparotomy operation, a thoracotomy operation, a craniotomy operation, and a body surface operation, and which enables an operation to proceed smoothly even when a surgical field is darkened or when a surgeon needs to indicate an accurate position to be operated to a surgical assistant.SOLUTION: A hand piece for an electric knife is used in any of a laparotomy operation, a thoracotomy operation, a craniotomy operation, and a body surface operation. The hand piece for the electric knife includes a body part that is operated by a surgeon by being held by a hand of the surgeon, an electrification part that is connected to the body part along an extending direction of the body part with an insulating part interposed therebetween, and an auxiliary member that is formed on the body part to assist hand maneuvers of the surgeon.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】 開腹手術、開胸手術、開頭手術、体表手術等の外科系手術に用いられる電気メスにおいて、術野が暗転した場合や、施術者が手術助手に対して正確な術部位置を指し示す必要が生じたとしても、手術を円滑に進行することが可能な電気メスのハンドピースを提供する。【解決手段】 開腹手術、開胸手術、開頭手術、又は体表手術の何れかに用いられる電気メスのハンドピースであって、施術者が手に把持して操作する本体部と、前記本体部の延在方向に絶縁部を介して接続された通電部と、前記本体部に形成され、施術者の手技を補助する補助部材とを備えることを特徴とする電気メスのハンドピース。【選択図】 図1