A kind of improvement of polygon bone ash jar structure include an outer tank,One inner canister,One inner cover and an outer cover,The outer tank be in polygon and one of upwardly opening tank body,Have one of ring-type groove on its open end,One of soft materials washer is embedded in the groove,The washer is in round and protrudes the open end,The inner canister is separably set in the outer tank,And one of upwardly opening tank of tool is for accommodating bone ash or osseous remains,The inner cover can cover the opening of the tank of the inner canister,A side of the outer cover is swingably incorporated on the relative side of the outer tank,Make the outer cover can the outer tank upturning lid for will the inner canister and the inner cover sealing what inside； By above structure system make it have just what replacement outer tank,Saving cost,The effect of foreign objects such as remains or the dry medicament of the universe and good sealing effect can be accommodated.一種多邊形骨灰罈結構改良包括一外罐、一內罐、一內蓋及一外蓋，該外罐為呈多邊形且朝上開口之一罐體，其之開口端面上具環狀之一槽溝，該槽溝中嵌設有軟性材質之一墊圈，該墊圈呈圈狀且凸出該開口端面，該內罐可分離地置設在該外罐中，且具朝上開口之一容槽可供容置骨灰或遺骨，該內蓋可封蓋住該內罐之容槽的開口，該外蓋的一側邊可擺動地結合在該外罐的相對側邊上，使該外蓋可在該外罐上翻蓋以供將該內罐及該內蓋密封於內部；藉由上述結構係使其具有便於更換外罐、節省成本、可容置遺物或乾燥藥劑等外物及密封效果佳之功效。
