A bed according to the present invention includes: a seating part having a pair of mounting frames which are mounted on a top surface of a mattress and project upward so as to be in close contact with both sides of the mattress; A body housing coupled to an upper side of the seat portion and having an inner space; A sheet feeding roller in which a new bed sheet is wound and mounted in a rotatable structure in the body housing; And a sheet collecting roller that is wound around the upper surface of the mattress to be wound and unwound from the sheet supplying roller and is rotatably mounted in the body housing, wherein the sheet collecting roller is provided with a through slot The sheet sheet wound on the sheet feeding roller is wound on the outer circumferential surface of the sheet collecting roller after an end of the sheet passes through the through slot. The bed for adults according to the present invention is constructed such that the bed sheet wound on the feeding roller covers the upper surface of the mattress and is wound on the retrieving roller so that the bed sheet can be easily replaced only by rotating the retrieving roller, It is possible to maintain the state that the sheet is always tightly tensioned and to easily replace the feeding roller and the collecting roller around which the bed sheet is wound and to prevent the phenomenon that the bed sheet is biased to one side when the bed sheet is replaced.
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