To readily and easily connect a lid to a container or remove the lid from the container and to arrange the lid and the container at regulated positions ensuring correlated and reliable connection at a mutually connected position.

At least one recessed part 29 in the entering area for a lid 3 are formed on the inner surface of a container 2, and at least one locking elements 19, 20, and 28 are arranged at the lid 3. The elements 19, 20, and 28 can be engaged with the part 29 through a locking operation means 23.