In the case of a conventional screen holding structure, in the case where, due to external force, the case is deformed, the restoration of the case is insufficient due to the frictional force caused between each of the pressure members and the screen, even though the external force is removed. Accordingly, it has been a problem that relative positional misalignment between the optical engine and the screen is left, whereby image distortion is caused. A projection apparatus is configured in such a way that pressure members 201 and 203 that press in the direction which is perpendicular to the screen plane and hold the peripheral edges of a screen 20 are provided, and the pressing force that is applied by the pressure member 201 to the top edge of the screen 20 is smaller than the pressing force that is applied by the pressure member 203 to the bottom edge.