A vial shield (1) has a shield main body (10) and a valve element (20). The shield main body (10) includes an annular top plate (11) that is to be laid on top of an upper surface of a stopper (86) that seals a mouth (83) of the vial bottle (80), a plurality of legs (15) extending downward from the top plate (11), and a plurality of claws (16) provided in the plurality of legs (15), the claws being engageable with the mouth (83) of the vial bottle (80). The valve element (20) blocks an opening at the center (12) of the top plate (11). A cut (22) passing through the valve element (20) in a vertical direction is formed in the valve element (20).