PURPOSE: To securely prevent a movable mirror from being stained and damaged and to enable excellent photography for a long period by providing a movable mirror switching means which switches the movable mirror to the position where its reflecting surface moves back away from in front of an opening for exposure associatively with rewinding starting operation for a film.

CONSTITUTION: If the movable mirror 30 is in a wide-angle state, i.e. at a 1st position when the film begins to be rewound, the movable mirror is switched automatically into the wide-angle state. Consequently, the movable mirror 30 is held at the 2nd position where its reflecting surface 30a moves back away from in front of the opening 16 for exposure during the rewinding operation for the film. Therefore, even if dust or dirt sticking in the film or an emulsifying agent peeled off the film enters a camera main body 10 through the opening 16 for exposure during the rewinding operation for the film, they are securely prevented from sticking on the reflecting surface 30a of the movable mirror 30. Consequently, the movable mirror is prevented from being stained and damaged to enable excellent photography for a long period.