To provide a down-sized lid body structure in which sufficient strength is secured.

A lid body that is opened and closed with respect to a main body has a sheet metal member 1, and shaft holes are formed at two arm-shaped parts 1a, 1b formed by bending both ends of the sheet metal member, and then in a part pinched by the two arm-shaped parts, a curl-bent shape part 1c is formed in which the metal plate is curl-bent while inserting a shaft into the shaft holes formed at the two arm-shaped parts and the curl-bent shape part, the lid body is journaled to the main body.