To provide a moving mechanism of a movable member for a film scanner which performs a pixel shifting method capable of simplifying the structure of the moving mechanism.

The film scanner which performs the pixel shifting method and improves the apparent resolution of an imager in film scanning by introducing the light emitted from a light source and transmitted through a photographed film to the imager of a plane form orthogonal with the optical axis of an optical system through the optical system and by moving the imager back and forth in two directions orthogonal with each other along the lining up direction of a number of photodetecting sections disposed at the imager is provided. The imager is made movable within the plane orthogonal with the optical axis by three guide surfaces which are disposed between a holder of the imager and a stationary guide member for guiding the imager holder and regulate the plane orthogonal with the optical axis. A driving system of the orthogonal two directions being the two directions where the driving directions intersect orthogonally with each other within the plane orthogonal with the optical axis is acted on the imager.