Incision forceps that are used by being passed through a forceps channel of an endoscope, comprising: a flexible tube that is inserted in a body cavity via the forceps channel； a long guide member that is disposed at a position projected from the distal end of the flexible tube； a forceps piece that is provided at the distal end and is provided to be capable of reciprocal movement between a near position that approaches the peripheral surface of the guide member and is projected from the distal end along the peripheral surface, and a far position F that is separated in a direction that intersects the axial line direction of the flexible tube with respect to the peripheral surface； characterized by the guide member being arranged on the axial line of the flexible tube.
