An adjustment mechanism (130) adjusts a position of a target object (110) attached to an attachment base (120). The adjustment mechanism (130) includes a first cam (131) and a second cam (132). The first cam (131) is attached to a shaft portion (123) on the attachment base (120). The second cam (132) houses the first cam (131) and supports the target object (110). The first cam (131) displaces the target object (110) via the second cam (132) by rotating about the shaft section (123) as a rotational axis. The second cam (132) displaces the target object (110) by rotating about the first cam (131) as a rotational axis. An amount of displacement of the target object (110) resulting from rotation of the first cam (131) differs from an amount of displacement of the target object (110) resulting from rotation of the second cam (132).