A camera body includes a body mount, an imaging element, an imaging element circuit board, a main circuit board, and a metal heat radiating plate. The body mount allows the lens unit to be mounted. The imaging element is disposed on the opposite side of the body mount from the side where the lens unit is mounted, and converts an optical image of the subject into image data. The imaging element circuit board is electrically connected to the imaging element and controls the imaging element. The main circuit board is disposed on the opposite side of the imaging element from the body mount, and includes a camera controller. The heat radiating plate is disposed between the imaging element and the main circuit board.