Storage cover of the portable electronic device

An object is to provide a cover for allowing an operation to an operating part provided on the rear surface of a portable electronic device when the electronic device being used. A cover (1) includes a front cover plate (2), a rear cover plate (3), and an attachment member (4) capable of being attached the electronic device (90). The front cover plate (2) and the rear cover plate (3) are connected to the attachment member (4) such that each relative angle thereof relative to the attachment member (4) are changeable.