Abstract: A container cap locking a plug member to a mouth by a locking member and capable of being removed from the mouth together with the plug member by repositioning a holder member. The locking member is covered on the container mouth so as to hold the plug and the holder member is fitted to the outer peripheral sides of a plurality of locking pieces of the locking member. In each locking piece, an upper side part is connected to a lower side part through a thin-walled bending part. The upper side part is locked to the rubber plug from the lower side with the holder member on the outer peripheral side thereof. The lower side part is locked to the container mouth from the lower side by the holder member. Locking projected parts prevent the lower end of the holder member from coming out of the upper side part.

Abstract: A container cap capable of securely locking a plug member to a mouth by a locking member when the cap is installed and capable of being easily and rapidly removed from the mouth together with the plug member merely by pulling out a holder member upward in unplugging, comprising the locking member 13 covered on the container mouth 2 so as to hold the rubber plug 3 and the holder member 14 fitted to the outer peripheral sides of the plurality of locking pieces 12 of the locking member 13. In each locking piece 12, an upper side part 12U is connected to a lower side part 12D through a thin-walled bending part 12a at the vertical intermediate part of the locking piece 12, the upper side part 12U is locked to the rubber plug 3 from the lower side with the holder member 14 fitted to the outer peripheral side thereof, and the lower side part 12D is locked to the container mouth 2 from the lower side with the holder member 14 fitted to the outer peripheral side thereof.

Abstract: This invention provides a container set for mixing at the time of administration allowing a secure mixing operation in administration without dripping chemicals by maintaining the sealed state of the mouth of liquid container particularly until the containers are connected to each other for mixing while storing two contents in the containers, respectively, wherein a tuber plug 5 is detachably fitted to the mouth part 4 of a vial 1 and a cap 30 is fitted to the mouth part 22 of the liquid container 2. The cap 30 has a first structure 31 fitted liquid-tightly to the mouth part 22 and a second structure 32 fitted liquid-tightly to the first structure 31 and having a connection port part 32a connectable liquid-tightly to the mouth part 4.