An treatment tool for a endoscope comprises a treatment tool insertion portion to be inserted into a channel of the endoscope an open/close member support portion formed in a distal end of the treatment tool insertion portion an open/close member which is freely supported so as to be opened or closed and treats a target site a liquid conduit which transports a liquid to a target site, liquid conduit being provided on an outside of the open/close member in a direction orthogonal to a lengthwise direction of the open/close member, and comprising at least one distal end aperture which opens toward the distal end direction of the open/close member support portion, the liquid conduit transports.
