Straight it releases the liquid even in a state in which to retract the electrode. Comprising an elongated tubular sheath (2), and its electrode member (3) which is caused to project and retract with respect to the distal end portion, and a liquid feeding means for feeding toward the flow path of the sheath distally, the electrode A tip enlarged portion (3b) extending radially outward radially outwardly of the member and having a proximal end face (3c) projected and retracted with respect to the distal end portion of the sheath is provided, and the sheath is provided with a distal end enlarged portion It includes regulating portion for regulating the movement of the part to the base end side of the electrode member at a position housed within the sheath and (6e), capable of accommodating housing portion at least part of the distal enlarged portion and (6d), the tip At the position where at least a part of the enlarged portion is housed in the sheath, after the liquid sent through the flow path hits against the proximal end surface of the distal enlarged portion and is caused to flow radially outward, the accommodating portion shape between the inner abutment on the circumferential surface, the inner peripheral surface of the housing tip enlarged portion of To provide a high frequency treatment tool 1 is released from the release port.電極を後退させたままの状態でも液体を真っ直ぐに放出する。 細長い筒状のシース(2)と、その先端部に対して突没させられる電極部材(3)と、シース内の流路内を先端側に向かって送液させる送液手段とを備え、電極部材の先端に、径方向外方に放射状に延び、シースの先端部に対して突没させられる基端面(3c)を有する先端拡大部(3b)が設けられ、シースが、先端拡大部の少なくとも一部をシース内に収容した位置で電極部材の基端側への移動を規制する規制部(6e)と、先端拡大部の少なくとも一部を収容可能な収容部(6d)とを備え、先端拡大部の少なくとも一部をシース内に収容した位置では、先端拡大部の基端面に、流路を介して送液されてきた液体が突き当たって径方向外方に流動させられた後に、収容部の内周面に突き当たり、先端拡大部と収容部の内周面との間に形成された放出口から放出される高周波処置具1を提供する。
