CARTRIDGE HOLDER, CARTRIDGE UNIT, AND DRUG INJECTION DEVICE TO WHICH CARTRIDGE UNIT IS MOUNTED

摘要

The present invention pertains to a cartridge holder and has, as the objective, preventing damage to a cartridge formulation resulting from dropping or the like. Also, in order to achieve the objective, the present invention is a cartridge holder (30) that holds a cartridge formulation (21), is mounted to a drug injection device, and has a holder main body (40) and a stopper (22). The holder main body (40) has an aperture section (17) that is at the rear end side of the holder main body and to which the cartridge formulation (21) is inserted. The stopper (22) has a piston-insertion aperture section (23) to which a piston (14) for drug injection is inserted, and the stopper (22) is mounted to the aperture section (17) at the rear end side of the holder main body (40) in order to hold the cartridge formulation (21) within the holder main body (40).