An image-forming apparatus with good yield and high reliability is provided by devising and improving the shape of a supporting member. Therefore, a flat type image-forming apparatus has at least a rear plate, a face plate arranged oppositely to the rear plate, and a supporting member arranged between the rear plate and the face plate and holding the distance between the rear plate and the face plate in an outer circumferential edge portion. In this flat type image-forming apparatus, the shape of a nook portion of the supporting member is set to an arc shape on the inner or outer side of a container.