An electronic device that can be attached to a cover and an electronic device attached to a cover are provided. The electronic device includes an electronic device body, a recess formed in an outer surface of the electronic device body, a movable member placed in the recess, an elastic member placed in the recess and supporting the movable member, and a retaining member placed in the recess and disposed around the movable member. The elastic member and the movable member are disposed to elastically bias the movable member from an inside of the recess to the outer surface of the electronic device body.