A camera to which a camera accessory is detachably attachable, the camera comprising: a camera side mount to be detachably coupled with an accessory side mount provided in the camera accessory, the camera side mount being provided with camera side bayonet claws and being brought, by relative rotation with the accessory side mount, from a first state in which each of accessory side bayonet claws provided in the accessory side mount is inserted between the camera side bayonet claws into a second state in which the camera side bayonet claws engage with the accessory side bayonet claws to complete coupling of the camera side and accessory side mounts; a camera side contact holding portion provided in the camera side mount; and a plurality of camera side contact pins (202a n) arranged in a relative rotation direction of the accessory side and camera side mounts and held by the camera side contact holding portion so as to be movable in directions of protruding and retracting with respect to the camera side contact holding portion, wherein the accessory side mount is provided with an accessory side contact holding portion and a plurality of accessory side contact surfaces (302a n) arranged in the relative rotation direction and held by the accessory side contact holding portion, and the camera side contact pins make contact with the accessory side contact surfaces in the second state to electrically connect the camera with the camera accessory, and characterised in that between the camera side mount and a body of the camera, a single leaf spring is disposed which biases the camera side contact pins in the direction of protruding with respect to the camera side contact holding portion, and when the camera being in a horizontal, long position is viewed from a direction facing the camera side mount, a line extending from a center of the camera side mount in a direction of gravity is defined as a mount center line, the single leaf spring extends from both sides of the mount center line toward the camera side contact pins so as to come close to the camera side contact pins, and the camera side contact pins are arranged in the camera side contact holding portion at positions other than a position on the mount center line and in correspondence with the accessory side contact surfaces of the accessory side contact holding portion. a camera side mount to be detachably coupled with an accessory side mount provided in the camera accessory, the camera side mount being provided with camera side bayonet claws and being brought, by relative rotation with the accessory side mount, from a first state in which each of accessory side bayonet claws provided in the accessory side mount is inserted between the camera side bayonet claws into a second state in which the camera side bayonet claws engage with the accessory side bayonet claws to complete coupling of the camera side and accessory side mounts; a camera side contact holding portion provided in the camera side mount; and a plurality of camera side contact pins (202a n) arranged in a relative rotation direction of the accessory side and camera side mounts and held by the camera side contact holding portion so as to be movable in directions of protruding and retracting with respect to the camera side contact holding portion, wherein the accessory side mount is provided with an accessory side contact holding portion and a plurality of accessory side contact surfaces (302a n) arranged in the relative rotation direction and held by the accessory side contact holding portion, and the camera side contact pins make contact with the accessory side contact surfaces in the second state to electrically connect the camera with the camera accessory, and characterised in that between the camera side mount and a body of the camera, a single leaf spring is disposed which biases the camera side contact pins in the direction of protruding with respect to the camera side contact holding portion, and when the camera being in a horizontal, long position is viewed from a direction facing the camera side mount, a line extending from a center of the camera side mount in a direction of gravity is defined as a mount center line, the single leaf spring extends from both sides of the mount center line toward the camera side contact pins so as to come close to the camera side contact pins, and the camera side contact pins are arranged in the camera side contact holding portion at positions other than a position on the mount center line and in correspondence with the accessory side contact surfaces of the accessory side contact holding portion.