To provide an urn which returns to the earth so as to meet the demand of those of increasing number who are much concerned about the natural funeral, wish to avoid any burden on the coming generations of decreasing population, and wish that their deeds are useful for their families and nation, or their own ashes return to earth of their nation together with the urn.

Ashes (10) are placed in the urn (1) to return to the earth, and the urn (1) to return to the earth is buried by developing a place suitable for a national forest.