To provide the simple and firm structure of a coffin made of paper, reducing the cost of manufacturing.

The structure, constituted in such a manner that a plurality of paper plates are folded for coupling, includes an external bottom plate, a bottom raising plate and an external cover plate. In the structure, a reinforcing bottom plate and a reinforcing cover plate are installed in addition, and the bottom raising plate is interfolded so as to form a rectangular vessel-shaped container. Furthermore, a concave reinforcing bottom plate is placed inside the bottom raising plate, the external bottom plate surrounds the outside of the bottom raising part, an improvement in external appearance and the reinforcement of the structure are brought out, and an upper coffin cover is constituted by combining the external cover plate with the reinforcing cover plate. The structure is characteristically made simple, firm and low in manufacturing cost.