Patent ID: 8837062

Claim:
A lens unit configured to be demountably mountable on a camera body configured to shoot and record images and provided with a lens configured to image an object image, comprising: a movable member configured to move by mounting and demounting of the lens unit; an operating member provided on an outer periphery of the lens unit body and configured to be operated by a user; an operation locking member configured to switch the operating member between an operable state and an inoperable state; and an urging member configured to urge the operation locking member in a second direction, wherein when the lens unit is mounted on the camera body, the movable member moves in a first direction and the operation locking member, also moving in the first direction, is released from engagement with the operating member, and the release of the engagement allows the operating member to be movable, so that the operable state is achieved, when the lens unit is demounted from the camera body, if the movable member moves in a second direction opposite the first direction, the operation locking member is moved in the second direction by the urging member, and this movement and hence the operating locking member is brought into engagement with the operating member, so that the operating member is fixed and is brought into the inoperable state by the engagement, wherein a plurality of the operating member grooves are provided on the entire circumference of the inner side of the operating member and, when the lens unit is demounted from the camera body, the operation locking member boss is fitted into any one of the plurality of operating member grooves.