PROBLEM TO BE SOLVED: To provide an organ fixing device which can reliably deliver a lock part for fixing an organ inside the organ.SOLUTION: A plunger 200 delivers one or a plurality of lock parts for fixing an organ from an accommodation part. A narrow width part 324 of a slider member 300 releasably restricts the delivery of the lock part by the plunger 200. Press buttons 301, 302 release the restriction of the plunger 200 by the narrow width part 324. The press buttons 301, 302 are shifted from a projection state of projecting to the outside of a housing 100 to a push-in state of receiving a push-in operation and entering the inside of the housing 100. When the press buttons are shifted to the push-in state, the restriction of the plunger 200 by the narrow width part 324 is released, and the press buttons 301, 302 are held in the push-in state.
