The present invention constitutes a seat cushion for triangular shape with excellent cushioning power, but forms a gentle curved protrusion on the triangular corner of the cushion, and the edge connecting the curved protrusion forms a slightly higher thigh support. , By forming a recessed portion inside the curved protrusion, it is possible to take a stable posture when sitting.;In configuring the seat cushion 10, the core 11 and the outer shell 12 constituting the cushion 10 in a triangular shape to form a flat smooth portion 14 in the interior of the front, the cushion ( At the rear edge portion of 10), a curved protrusion 15 is formed so that the hips can be positioned when seated, and the thigh support 16 is positioned at the front edge of the curved protrusion 15 at the thigh position. It is formed to protrude, and the point where it meets the inner smooth portion 14 of the curved protrusion 15, forming a groove 17 in a structure that can be located the peach bone of the ankle portion is comfortable when sitting on the cushion 10 It is configured to be seated in a comfortable and comfortable state.;Stool, cushion, buttocks, thighs, cross seat
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