A case including a device case, and an exterior member which is attached covering an outer circumferential surface of an upper part of the device case, in which the device case has a catching portion formed in an outer circumferential portion thereof, the exterior member has an engaging portion which is formed on an inner side portion thereof, engages with the catching portion when the exterior member is attached to the device case, and prevents the exterior member from being detached from the device case, and a support area which supports the engaging portion of the exterior member is formed of a material whose hardness is lower than hardness of a material of an area adjacent to the support area.