To provide a soap preventing the fact that the other soap made smaller by use or the like is thrown away by the difficulty to use the same and having a function of being used to the last without feeling troublesomeness.

The soap 1, e.g., has the characteristic of being having a hole 3 capable of containing the other soap 2, and is, e.g., contained with the soap made smaller and hard to be used, thus is integrated with the soap made smaller and hard to be used.