A camera body has grip portions for right-handed users and the left-handed users provided respectively on the right and left sides thereof. A release button to be operated by the right hand is mounted on the side of the grip portion for right-handed users, and a release button to be operated by the left hand is mounted on the side of the grip portion for left-handed users. A ring member is rotatably mounted about a lens-barrel. When the ring member is rotated toward the release button for right-handed users, the release button for right-handed users is enabled, and when it is rotated toward the release button for left-handed users, the release button for left-handed users is enabled.