To provide a structure of a coffin.

The structure of the lid of the coffin is provided with a first lid board, a second lid board, a third lid board, and a lid plywood, the first lid board, the second lid board, and the third lid board are bently molded, the first lid board is covered with the second lid board, the second lid board is covered with the third lid board so that the coffin structure is formed by stacking the three boards together. Lastly, the third lid board is covered with an external lid board and bently molded so that the assembling structure is completed. However, if only the cutting of the board piece is changed, a shape of the coffin different according to the cultural climate and custom can be formed by bending. The interval between the two boards are firmly stuck by an adhesive or nails according to its simple superimposed lid sticking structure, the outermost side is covered with the lid plywood so that the coffin structure entire body has a just slight joint, the number of board pieces can be increased/ decreased according to the necessity, structures of multiple types of different superimposed loads are provided so as to be served for the selective use, and the external appearance is improved by printing patterns fitted to the external surface thereon or sticking an environmental protection material thereto.