SEAT

Provided is a seat capable of suppressing generation of wrinkles around an opening of a curved surface portion of a skin. The seat is provided with: a skin (6) in which a curved opening (6a) is formed in a curved surface portion (6b); an elastically deformable plate-shaped reinforcing member (9) that reinforces a peripheral area of the opening (6a), the reinforcing member (9) being disposed in a curved state along an inner surface of the curved surface portion (6b); and a pressing member (7) that covers the peripheral area of the opening (6a) in a state where the pressing member (7) presses the peripheral area of the opening (6a) from an outer surface of the curved surface portion (6b). The reinforcing member (9) has a main body portion (9a) overlapping with the pressing member (7), and extending portions (9b, 9c) respectively extending from side edges of the main body portion (9a) to a range not overlapping with the pressing member (7). A slit (9e, 9f) is formed in each of the extending portions (9b, 9c). The slits (9e, 9f) extend in a direction that a portion (9b1, 9c1) disposed outside in the width direction of the extending portion (9b, 9c) is elastically deformable independently from the main body portion (9a).