MEDICATION ADMINISTERING DEVICE

PROBLEM TO BE SOLVED: To provide a medication administering device which injects a preparation into a living body and can allow a preparation syringe to be mounted in a simple and reliable manner.SOLUTION: A medication administering device 111 has, mounted thereon, a preparation syringe 15 containing a preparation 29 and administers the preparation 29 to a living body. The medication administering device 111 includes a syringe cover 14, a piston 43, and a syringe holder 21. The syringe cover 14 is a substantially cylindrical member that holds the preparation syringe 15 on the inner peripheral surface side thereof and is detachable. The piston 43 presses a rear end of the preparation syringe 15. The syringe holder 21 includes the piston 43 at a predetermined position and guides, on a cylindrical inner peripheral surface side, an outer peripheral surface of the preparation syringe 15 towards the piston 43 to allow the outer peripheral surface to be fitted into the syringe cover 14.