To provide a container lid opener capable of conveniently opening the lid of a disposable sealed container, and a case having the container lid opener formed.

A container lid opener comprises a fitting-in portion 10 which has front and lower faces opened and has lock projections 13, projecting inward, formed at lower ends of both side faces so that the head portion of a container is fitted in onto the lock projection, and a handle portion 20 connected to the fitting-in portion. A blocking film which stops the heat portion of the container from being fitted in more when the whole head portion is fitted in is provided inside the fitting-in portion.