An apparatus for projection capable of projecting light on a built-in transmission type screen or on a wall screen as desired. The apparatus has a door that may be opened and a movable mirror. The door is opened when a film is projected on the wall screen and closed when the film is projected on the built-in transmission type screen. The door and the movable mirror are operatively connected such that the movable mirror is positioned to direct the projected light to the outside when the door is closed. The apparatus also has three legs for the adjustment of the projection angle.