Forward and backward movement of a wire guide member in an axial direction of the wire guide member is restricted, by the wire guide member abuts on a distal end portion holding member and a proximal end portion holding member. The wire guide member is held by an intermediate holding member, the distal end portion holding member, and the proximal end portion holding member to allow insertion and forward and backward movement in the intermediate holding member, the distal end portion holding member, and the proximal end portion holding member. The wire guide member has elasticity.