To enhance sleeping comfort by use of a simple arrangement by providing both support members having seat portions and backrests with main body portions with non-parallel surfaces and auxiliary portions, and providing the main body portions with portions which are recessed relative to the auxiliary portions.

This vehicle seat has a first support member with a seat portion and a second support member with a seat backrest 16 reclinable from a vertical normal position. In this case, at least one of the support members is provided with a main body portion 22, 32 with non-parallel first and second surfaces and an auxiliary portion 28, 38. The main body portion 22, 32 is provided with a recessed portion 26, 36 with respect to the auxiliary portion 28, 38. Further, the auxiliary portion 28, 38 is positioned within the recessed portion 26, 36 at a position such that the first surface abuts the surface of the recessed portion 26, 36 so that the second surface is coplanar with an adjacent surface of the main body portion 22, 32.