A surgical high-frequency electrosurgical treatment instrument includes a pair of forceps pieces, an insulating member, a transmission member, an operation rod member, a distal end cover member, a shaft member, and an operation unit. In addition, the surgical high-frequency electrosurgical treatment tool is formed between the operation rod member and the shaft member and is disposed along the longitudinal direction of the operation rod member, and includes a flow path portion through which the liquid flows, and a flow path portion A groove portion into which the liquid flows from the flow path portion, and an opening portion communicating with the groove portion and supplying the liquid near the proximal end portion of the pair of forceps pieces.手術用高周波電気外科用処置具は、1対の鉗子片と、絶縁部材と、伝達部材と、操作ロッド部材と、先端カバー部材と、シャフト部材と、操作部とを有している。また手術用高周波電気外科用処置具は、操作ロッド部材とシャフト部材との間に形成され、且つ操作ロッド部材の長手方向に沿って配設され、液体が流れる流路部と、流路部と連通し、流路部から液体が流入する溝部と、溝部と連通し、1対の鉗子片の基端部付近に液体を供給する開口部とを有している。
