A syringe pressurization device configured to be attached to a syringe including a barrel and a gasket sliding inside the barrel , the syringe pressurization device comprising: a plunger configured to advance the gasket in a distal end direction; and a grip attachable to the barrel from a direction perpendicular to an axis of the barrel and supporting the plunger , wherein the plunger includes a plunger rod including a screw thread disposed on an outer circumferential surface thereof, and a pressing part disposed at a distal end portion of the plunger rod and configured to press the gasket in a distal end direction, wherein the plunger is a syringe plunger comprising: a rotary operation part disposed at a proximal end portion of the plunger rod , wherein the rotary operation part includes a finger hook rotary operation part protruding in a direction perpendicular to an 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 , the screw thread is configured to be screwed with a female screwing part , the syringe plunger is configured to advance in a distal end direction by a screwing action between the screw thread and the female screwing part so as to press the gasket in a distal end direction, and an outer diameter of the pinch rotary operation part is smaller than an outer diameter of the finger hook rotary operation part , and wherein said grip includes: a flange attachment part attachable to a flange disposed at a proximal end portion of the barrel , a female screwing part disposed proximal of the flange attachment part and screwed to the screw thread , and an accommodation part disposed between the flange attachment part and the female screwing part and configured to accommodate the pressing part . a plunger configured to advance the gasket in a distal end direction; and a grip attachable to the barrel from a direction perpendicular to an axis of the barrel and supporting the plunger , wherein the plunger includes a plunger rod including a screw thread disposed on an outer circumferential surface thereof, and a pressing part disposed at a distal end portion of the plunger rod and configured to press the gasket in a distal end direction, wherein the plunger is a syringe plunger comprising: a rotary operation part disposed at a proximal end portion of the plunger rod , wherein the rotary operation part includes a finger hook rotary operation part protruding in a direction perpendicular to an 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 , the screw thread is configured to be screwed with a female screwing part , the syringe plunger is configured to advance in a distal end direction by a screwing action between the screw thread and the female screwing part so as to press the gasket in a distal end direction, and an outer diameter of the pinch rotary operation part is smaller than an outer diameter of the finger hook rotary operation part , and wherein said grip includes: a flange attachment part attachable to a flange disposed at a proximal end portion of the barrel , a female screwing part disposed proximal of the flange attachment part and screwed to the screw thread , and an accommodation part disposed between the flange attachment part and the female screwing part and configured to accommodate the pressing part . a flange attachment part attachable to a flange disposed at a proximal end portion of the barrel , a female screwing part disposed proximal of the flange attachment part and screwed to the screw thread , and an accommodation part disposed between the flange attachment part and the female screwing part and configured to accommodate the pressing part . <EOS>