To prevent the stuck moisture infiltration of dry ice and provide a heat insulation effect inside a coffin by working both side faces of a corrugated fiber board coffin box to a dual structure, providing a hollow part between an inner surface and an outer surface and installing the dry plywood of high water absorptivity to a coffin bottom surface further.

By working a corrugated fiber board box body to be double and installing the dry plywood to the coffin bottom surface, the strength of a long box is reinforced. Thus, weight is made light, folding is easily performed, the heat insulation effect is improved and simultaneously, the strength of the box body is reinforced. Thus, since the weight is made light and folding is performed, helicopter air transportation is made possible and use and carrying-in together with the dry ice are made possible as well. Also, since a price is low, it is sufficiently used even for the funeral of a person related to welfare.