PROBLEM TO BE SOLVED: To provide a cinerary urn that can be easily manufactured at low cost without using a biodegradable material.SOLUTION: A cinerary urn 1 is configured to be naturally collapsed by moisture absorption operation and returned to soil. The cinerary urn includes an urn body 4 and a lid 5 covered on an upper end opening part 3 of the urn body. Each of the urn body 4 and the lid 5 is a member in the unfired state while a china clay is formed and dried. The china clay maintains a self-shape retention in the room of a general house, and includes hygroscopicity of absorbing the moisture in the soil and losing the self-shape retention when buried in the soil. The lid 5 functions as a weight to crush the urn body 4 in which the self-shape retention is decreased by the moisture absorption.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】生分解性の素材を用いずに簡単かつ廉価に製作できる骨壺を提供すること。【解決手段】吸湿作用により自然崩壊して土に戻る骨壺1は、壺本体4と、この壺本体の上端開口部3に被せる蓋5とを備えている。壺本体4および蓋5のそれぞれは、陶土を成形して乾燥させたままの未焼成状態の部材である。陶土は、一般住宅の室内では自己保形性を保ち、土中に埋めておくと、土中の湿気を吸収して自己保形性を失う吸湿性を備えている。蓋5は、吸湿によって自己保形性の低下した壺本体4を押し潰すための錘として機能する。【選択図】図1
