A high-frequency treatment tool comprising: an elongated cylindrical sheath to be inserted into a body; a straight bar-shaped electrode member to which high-frequency current is to be supplied, the electrode member being disposed so as to be advancable and retractable in the sheath in a longitudinal axis direction; a distal end member that is disposed at a distal end of the sheath and that has a through hole through which the electrode member is passed; and a liquid feeding means that is connected to a proximal end side of the sheath and that is configured to release a liquid forward in the longitudinal axis direction of the sheath through a channel formed in the sheath and a gap between the electrode member and the through hole in communication with the channel, wherein the electrode member includes a bar-shaped columnar portion; an electrode distal end portion being provided at a distal end of the columnar portion and radially extending in a radially outward direction; and a stopper portion disposed at a proximal end side of the columnar portion with respect to the distal end member, the stopper portion being fixed to the electrode distal end portion via the columnar portion and substantially having the shape of a solid of revolution centered on a center axis of the electrode member, the distal end member has a tapered inner surface that abuts against the stopper portion in the longitudinal axis direction when the electrode member is maximally moved forward from a distal end of the distal end member, the tapered inner surface narrowing toward the distal end, a recessed portion that constitutes a channel through which the liquid can be distributed in a state in which the tapered inner surface and the stopper portion abut against each other is formed in the stopper portion, the recessed portion being formed in a portion in a circumferential direction about the center axis, and distribution of the liquid is limited such that the liquid flows out toward a distal end side of the stopper portion only through the recessed portion as the entire circumference of the stopper portion except for the recessed portion abuts against the tapered inner surface, the electrode distal end portion has a radially protruding portion and a radially recessed portion in a circumferential direction of the electrode distal end portion and the channel constituted by the recessed portion and the radially recessed portion is located at the same position in the circumferential direction, and the radially recessed portion are located in front of the liquid flowing out from the recessed portion in the longitudinal axis direction so that the liquid is released in a straight line in the forward direction through the radially recessed portion. an elongated cylindrical sheath to be inserted into a body; a straight bar-shaped electrode member to which high-frequency current is to be supplied, the electrode member being disposed so as to be advancable and retractable in the sheath in a longitudinal axis direction; a distal end member that is disposed at a distal end of the sheath and that has a through hole through which the electrode member is passed; and a liquid feeding means that is connected to a proximal end side of the sheath and that is configured to release a liquid forward in the longitudinal axis direction of the sheath through a channel formed in the sheath and a gap between the electrode member and the through hole in communication with the channel, wherein the electrode member includes a bar-shaped columnar portion; an electrode distal end portion being provided at a distal end of the columnar portion and radially extending in a radially outward direction; and a stopper portion disposed at a proximal end side of the columnar portion with respect to the distal end member, the stopper portion being fixed to the electrode distal end portion via the columnar portion and substantially having the shape of a solid of revolution centered on a center axis of the electrode member, the distal end member has a tapered inner surface that abuts against the stopper portion in the longitudinal axis direction when the electrode member is maximally moved forward from a distal end of the distal end member, the tapered inner surface narrowing toward the distal end, a recessed portion that constitutes a channel through which the liquid can be distributed in a state in which the tapered inner surface and the stopper portion abut against each other is formed in the stopper portion, the recessed portion being formed in a portion in a circumferential direction about the center axis, and distribution of the liquid is limited such that the liquid flows out toward a distal end side of the stopper portion only through the recessed portion as the entire circumference of the stopper portion except for the recessed portion abuts against the tapered inner surface, the electrode distal end portion has a radially protruding portion and a radially recessed portion in a circumferential direction of the electrode distal end portion and the channel constituted by the recessed portion and the radially recessed portion is located at the same position in the circumferential direction, and the radially recessed portion are located in front of the liquid flowing out from the recessed portion in the longitudinal axis direction so that the liquid is released in a straight line in the forward direction through the radially recessed portion.