To provide a method of manufacturing a seat, carrying out a crushing and a urethane foaming simultaneously in a manufacture of the seat while enhancing a fitness of a body to of the seat to improve comfortableness.

Thie vehicular seat is composed of a surface layer part 19 with insert pads 1, 3 inserted in side parts 7, 9 formed integrally with main parts 11, 13 of the seat 5; the insert pads 1, 3 disposed at the inner parts of the main parts 11, 13; and an outer peripheral part 23 formed between the surface layer part 19 and the insert pads 1, 3. The outer peripheral part 23 is formed to be harder than the insert pads 1, 3 and the surface layer part 19. The whole of the side parts 7, 9 are thereby made harder than the main parts 11, 13 of the seat 5.