A digital still camera includes a camera main unit and a lens barrel fitted thereon in a removable manner. First electric contacts in a group are disposed on the camera main unit. Second electric contacts in a group are disposed on the lens barrel, for electric contact with the first electric contacts upon mounting of the lens barrel on the camera main unit, and for communication between those. The camera main unit includes a connector, having the first electric contacts, and coupled with a camera front face in an openable manner. The lens barrel includes a cavity, having the second electric contacts, for receiving insertion of the connector opened in a forward direction. The first electric contacts are disposed on a rear surface positioned internally when the connector is closed. Furthermore, a retaining mechanism retains the connector being inserted in the cavity.