A syringe plunger includes a plunger rod having a screw thread disposed on an outer circumferential surface, and a rotary operation part disposed at a proximal end portion of the plunger rod. The rotary operation part includes a finger hook rotary operation part protruding in a direction perpendicular to the axis of the plunger rod, and a pinch rotary operation part protruding in a proximal end direction from the finger hook rotary operation part coaxially with the plunger rod.
