Provided is a drug injection syringe which, without leaking, reduces dead volume and minimalizes the amount of the drug remaining in the syringe, and which can efficiently inject a small amount of the drug into the body. This drug injection syringe (1) is provided with: an injection needle assembly (50) comprising a needle hub (80) which holds an injection needle (90), an elastic body (70) which is mounted in the needle hub (80) and into which the injection needle (90) is inserted, and a fitting tube (60) which accommodates the needle hub (80) and the elastic body (70) and has a fitting hole (61) having a female-type taper (63)； and a syringe body (10) comprising an outer tube (30) which accommodates a drug (31) in a sealed manner, and a drug discharge tube (40) having a male-type taper (43) which is fitted into the female-type taper (63). The syringe body (10) connects to the injection needle assembly (50) by fitting which involves pushing the drug discharge tube (40) into the fitting hole (61). The elastic body (70) has a depression (73) on the surface in contact with the leading edge of the drug discharge tube (40), and by fitting, a protruding part (72) on the peripheral edge of the depression (73) is compressively deformed and is pushed so as to expand to the inner wall of the fitting hole (61) in a water-tight manner, connecting the drug discharge tube (40) and the injection needle (90) in a water-tight manner.L'invention fournit une seringue pour médicament liquide dans laquelle il n'y a pas de fuite de liquide, le volume mort est réduit et la quantité de médicament liquide rémanente est faible, et qui permet d'administrer efficacement à l'intérieur d'un corps une petite quantité de médicament liquide. Plus précisément, l'invention concerne une seringue pour médicament liquide (1) qui est équipée : d'un ensemble pour aiguille à injection (50) qui possède un raccord d'aiguille (80) supportant une aiguille à injection (90), un corps élastique (70) monté sur le
