To provide a shutter mechanism that has high durability and is capable of operating at high speed and a microscope that includes the shutter mechanism. A microscope according to the present technology includes an optical system, a first light-receiving element, and a shutter mechanism. The shutter mechanism includes a rotation power source that generates rotation power, a crank that converts the rotation power generated by the rotation power source into a back-and-forth movement, and a shutter connected to the crank, the shutter moving back and forth according to the crank between a first position at which a first optical path from the optical system to the first light-receiving element is blocked and a second position at which the first optical path is not blocked.