Disclosed is an Injection syringe with a guide contacting a slope for dispensing a fixed volume to allow the easier dispensing of a fixed volume of medicament. A fixed amount discharge container (1) having a syringe barrel (3) and a piston (8) that is inserted into the syringe (3) so as to be movable in a longitudinal direction and that forms a liquid chamber with the syringe (3). Either the syringe (3) or the piston (8) is provided with a guide part (3c) that extends in the longitudinal direction thereof. The other part from between the syringe (3) and the piston (8) is provided with a slider (9) capable of moving within the guide part (3c) together with either the syringe (3) or the piston (8). The guide part (3c) is provided with a target position contact part (3j) that is contacted by the slider (9) when the liquid chamber volume becomes equal to a target volume, and the guide is provided with a slope which the slider contacts so that the slider moves along the slope.
