A vehicle seat is provided with a side support device configured to assist vehicle exit behavior of an occupant while stably securing a holding property for the sitting occupant. The vehicle seat includes a side support device configured to support a cushion side portion of a seat cushion to be switchable between a seating available position and a vehicle exit assist position, a lock device configured to lock the cushion side portion in the seating available position, and a lock release device configured to release a lock state of the lock device. The lock release device includes a first lever configured to detect sitting of the occupant on a cushion center portion and a second lever configured to detect sitting of the occupant on the cushion side portion. The lock state is released when the detection by the second lever occurs while the detection by the first lever continues.