Problem to be solved: to provide a cushion that can be easily improved in both directions.Solution: the cushion 1 is provided with a cover 10, which can be used for switching the seating surface and the ground plane by upwardly and reversing, so as to be sewn in the form of a bag, and a pad 20 disposed inside the cover 10.Cover 10A first cover piece 11 for forming one surface of a seating surface and a ground planeA second cover piece 12 for forming the other surface andCover pieceThe circumference suture Part 13 to suck the periphery of 12 andThe fin portion 14, which extends from the whole circumference of the peripheral suture Part 13 to the outer side, is provided with a fin part 14 which can be switched between the state where the peripheral suture Part 13 is extended upwardly to the base end and the state where it is extended downward.The core 16, which is inserted into the fin portion 14 and is inverted by elastic deformation in the vertical direction by the switching operation of the fin portion 14, and is held at the respective positions in which the fin portion 14 is switched to the upward and downward directions, respectively..Diagram
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