A suture-needle holder (2, 2A, 2B, 2C, 2D) comprising: a sheath part capable of being inserted into the inside of a body; a pair of grasping members (31, 32) fixed to a distal end part of the sheath part and capable of grasping a suture needle by approaching each other and being closed; an operation wire connected to the pair of grasping members (31, 32) and operated to open and close the pair of grasping members (31, 32) by moving relative to the sheath part along a longitudinal axis of the sheath part; and an operation part body formed in a shaft shape to extend along the longitudinal axis and attached to the operation wire, and connected to the sheath part such that the sheath part is movable in a direction aligned with the longitudinal axis and rotatable around the longitudinal axis with respect to the operation part body, wherein a first groove part having a distal end and a proximal end and extending along the longitudinal axis, and a second groove part that is spirally formed and has one end connected to the proximal end of the first groove part and the other end at a position separated from the one end in a spiral direction aligned with the longitudinal axis, and extending proximally from the one end to the other end are formed in an outer peripheral surface of the operation part body, wherein a proximal end part of the sheath part is provided with a protruding part that protrudes to a radial inner side of the sheath part, wherein the protruding part has a first state where the protruding part moves in a state where the protruding part is engaged within the first groove part, and a second state where the protruding part moves in a state where the protruding part is engaged within the second groove part, wherein in the first state, the operation wire is adapted to be pulled with respect to the sheath part, and thereby the protruding part is moved from a distal end side of the first groove part to a proximal end side within the first groove part and the pair of grasping members (31, 32) is closed to grasp the suture needle, and wherein in the second state, the operation wire in the first state is further pulled with respect to the sheath part, and thereby the protruding part is moved from the one end of the second groove part toward the other end within the second groove part, and the pair of grasping members (31, 32) and the sheath part are turned around the longitudinal axis with respect to the operation part body in a state where the pair of grasping members (31, 32) has grasped the suture needle. a sheath part capable of being inserted into the inside of a body; a pair of grasping members (31, 32) fixed to a distal end part of the sheath part and capable of grasping a suture needle by approaching each other and being closed; an operation wire connected to the pair of grasping members (31, 32) and operated to open and close the pair of grasping members (31, 32) by moving relative to the sheath part along a longitudinal axis of the sheath part; and an operation part body formed in a shaft shape to extend along the longitudinal axis and attached to the operation wire, and connected to the sheath part such that the sheath part is movable in a direction aligned with the longitudinal axis and rotatable around the longitudinal axis with respect to the operation part body,