PURPOSE: To make only a syringe main body disposable and to leave fluctuation of injection condition of a liq. as data by using a syringe apparatus with time by providing the apparatus with a displaying means displaying and recording with time the pressure detected by a pressure sensor fixed on the syringe main body and printing out to the outside.

CONSTITUTION: Fitting parts 15 are formed so as to communicate with each other on the upper part of the apex part 13 of a cylinder 12 and the apex part of a pressure sensor 4 is inserted therein through a pressure receiving plate attached to the fitting part 15 and it is removably fixed through clips 17 hooked on both side part of the apex part 13. The apex of a piston bar 20 on which a male screw part 20a is formed through a bearing 19 is rotatably hooked on an axial core part of a piston 18 being slidably stored in the cylinder 12. The rear end part of the cylinder 12 is constituted to be a little larger diameter and a divided nut 21 and a slider 22 are stored therein slidably in the axial direction. In addition, a knob part 25 is fixed on the part penetrating the lid part 24 of the piston bar 20 and being projected outside.