Seat, seat cushion and backrest thereof

摘要

A backrest (3) of a seat includes: a pad (32) including a slit air guide hole (32a) which penetrates the pad from a front surface of the pad to a rear surface of the pad; a base member (31) for blocking the air guide hole (32a) on a rear side of the pad (32), the base member (31) including an inlet hole (31a) communicated with the air guide hole (32a); and a cover (33) for blocking the air guide hole (32a) on the front surface of the pad (32), the cover (33) including a plurality of outlet holes (33a) communicated with the air guide hole (32a).