This creation discloses a coffin which includes a bottom plate, two first side plates and two second side plates. The bottom plate includes a top surface, a bottom surface, two first narrow side surfaces and two second narrow side surfaces. The two opposite wide side surfaces of each first side plate are respectively defined as a first inner side surface and a first outer side surface, and each first side plate is concavely formed with a clamping groove from the first inner side surface to the first outer side surface. The length of each slot is equal to the length of each first narrow side surface. Each first side plate is fixed to one side of the first narrow side surface, and a side surface forming the card slot is correspondingly fixed to the first narrow side surface. The two second side plates are fixed to the two second narrow side surfaces of the bottom plate, and each second side plate shields the second narrow side surfaces of the bottom plate and the end surfaces of the two first side plates.本創作揭露一種棺材，其包含：底板、兩個第一側板及兩個第二側板。底板包含頂面、底面、兩個第一窄側面及兩個第二窄側面。各個第一側板彼此相反的兩個寬側面分別定義為第一內側面及第一外側面，各個第一側板由第一內側面向第一外側面內凹形成有卡槽。各個卡槽的長度等於各個第一窄側面的長度。各個第一側板固定於第一窄側面的一側，且形成卡槽的一側面對應固定於第一窄側面。兩個第二側板固定於底板的兩個第二窄側面，且各個第二側板遮蔽底板的第二窄側面及兩個第一側板的端面。
