A camera module includes a barrel, a movable lens movable in the barrel in an optical axis direction, an imaging device that captures an image of a subject viewed through the movable lens and an actuator that changes the distance between the movable lens and the imaging device. An object to be printed is placed on a platen, in a substantially centered position with respect to an outer frame having an open center. Each of the shoulder restraining portions continuously projects in upper part to rear part of the airbag. The base upper unit is mounted on a top of the base lower unit to cover the passage.