There is provided a pharmaceutical syringe unit (2) that is mounted to a pharmaceutical injection device main body (100) and holds a pharmaceutical syringe (5), in order to mount the pharmaceutical-filled pharmaceutical syringe (5) to a pharmaceutical injection device, wherein a syringe cover (4) is slid in the forward and backward direction with respect to a distal end cap (3) by the operation of the pharmaceutical injection device main body (100), allowing movement between a needle insertion position at which the insertion of an injection needle (14) into a target is completed, and a needle withdrawal position at which the withdrawal of the injection needle (14) from the target is completed, and the range (L2) over which the syringe cover can be slid by a guide component (26) is greater than the distance (L1) between the needle insertion position and the needle withdrawal position.
