Patent ID: 8493517

Claim:
An optical component adjustment mechanism for rotatably supporting an optical component around a predetermined axis, said optical component adjustment mechanism comprising: an optical component holder including a support frame to support the optical component, and first and second rotary salients projecting outside from the support frame in the predetermined axis; a holder support frame for rotatably supporting the first and second rotary salients; and a fixing member for fixing a position of a rotation of the optical component holder, wherein the holder support frame includes: an opening for inserting the optical component holder; first and second support members provided on both sides of the opening; a first overhanging member overhanging from an end portion of the first support member on a side opposite to the opening the second support member; and a second overhanging member overhanging from an end portion of the second support member on the side opposite to the opening toward the first support member, wherein, in a vicinity of the first overhanging member of the first support member, a first insertion groove with which the first rotary salient is arranged to rotatably engage is provided, and wherein, in a vicinity of the opening of the second support member, a second insertion groove with which the second rotary salient is arranged to rotatably engage and whose an upper side is open is provided.