An anti-shake apparatus of a photographing apparatus comprises a movable unit and a fixed unit. The movable unit has an imaging device and can be moved and rotated on a plane which is perpendicular to an optical axis of a camera lens of the photographing apparatus. The fixed unit supports the movable unit in a movable and rotatable situation on the plane. The movable unit and the fixed unit have a position-detecting apparatus that detects first position-information of the movable unit in a first direction being perpendicular to the optical axis. The is fixed unit has an optical sensor unit that has two position-detecting elements which are used for detecting the first position-information as the position-detecting apparatus. The movable unit has a slit light-source unit that has two slit light-sources which are used for detecting the first position-information as the position-detecting apparatus.