Provided is a high-frequency treatment tool (1) provided with: a long and thin cylindrical sheath (2)； a straight bar-shaped electrode member (3) that is disposed so as to be extendable and retractable in the longitudinal axis direction inside the sheath (2) and to which a high-frequency current is supplied； a leading end member (6) that is disposed at the leading end of the sheath (2) and that has a through-hole (6a) through which the electrode member (3) is inserted； and a liquid-feeding means (5) connected to the base end side of the sheath (2). The electrode member (3) is provided with: an electrode leading end section (3b) that is formed at the leading end thereof and that radially extends outward in the diameter direction； and a stopper part (7) having a substantially rotational body shape and disposed closer toward the base end side than the leading end member (6). The leading end member (6) is provided with a tapered inner surface (6b) that has a tapered shape tapering toward the leading end and that abuts the stopper part (7) in the longitudinal axis direction when the electrode member (3) is moved toward the leading end side to the utmost extent. A recessed part (9) that forms a flow path (2a) allowing flow of a liquid is formed on the tapered inner surface (6b) or the stopper part (7) when abutment occurs therebetween.La présente invention concerne un outil de traitement haute fréquence (1) comportant : une gaine cylindrique longue et mince (2) ； un élément d'électrode en forme de barre droite (3) qui est disposé de façon à être extensible et rétractable dans la direction de l'axe longitudinal à l'intérieur de la gaine (2) et auquel un courant haute fréquence est fourni ； un élément d'extrémité avant (6) qui est disposé au niveau de l'extrémité avant de la gaine (2) et qui comporte un orifice traversant (6a) à travers lequel l'élément d'électrode (3) est inséré ； et un moyen d'alimentation en liquide (5) relié au côté de l'extrémité de base de la gaine (2
