To reduce the waste of a source in cremation.

Remains are housed into a remains housing bag 1 and the remains housing bag 1 is housed into a coffin 21. In the cremation, the remains housing bag 1 is pulled out of the coffin 21 and the remains housing bag 1 is put to the cremation. The coffin 21 not yet to be put to the cremation is re-usable and the material is not limited. An opening part 22 for loading or unloading the remains housing bag 1 is formed on a side part of the coffin 21. The loading or unloading of the remains housing bag 1 is accomplished easily and strictly. A polymer absorbing material is applied on the internal surface of the remains housing bag 1 to prevent the leakage or the like of humor generated from the remains.