An endoscopic surgical device includes: a sheath； a forceps section protruding from a cover provided at a distal end of the sheath and including a pair of openable-closable forceps components； an operable member that is connected to a proximal end of the forceps section, that opens the forceps components when moved forward in a longitudinal direction, and that closes the forceps components when moved rearward； and a flow-path formation member having a through-hole through which the operable member extends and having a first liquid delivery hole constituted by a gap between the through-hole and the operable member and a second liquid delivery hole constituted by a gap between the flow-path formation member and an inner peripheral surface of the cover. The operable member is provided with a large-diameter section that abuts on the flow-path formation member when the operable member is moved forward to block the first liquid delivery hole.
