To provide a manufacturing method of a coffin made of paper the appearance of which is favorable, and which is gentle to the environment.

A coffin body semi-finished product, and a lid plate semi-finished product are manufactured by vacuum-molding of pulp, and in addition, a coffin body is integrally molded by compressing the coffin body semi-finished product and the lid plate semi-finished product by a molding die machine, and the wall surfaces are made as a solid core, and a favorable structure strength is obtained. An uneven pattern is formed by a pressing process on the internal surface and the external surface of the wall surface at the same time as the operation of the compression, and the surface is made as a glossy surface to increase the beauty of the appearance.