A camera body allows the mounting of a lens unit configured to form an optical image of a subject, and includes a body mount, an imaging element, a capacitor, and a housing member. The body mount allows a lens unit to be mounted. The imaging element includes a light receiving face arranged to receive light passing through the lens unit, and converts an optical image of the subject into an electrical signal. The capacitor is disposed more to the imaging element side than the body mount in a direction of the light passing through the lens unit. The housing member accommodates the imaging element and the capacitor. The camera body has no mirror box.