A vehicle seat has a seat cushion having a cushion pad deformable to be flexed when a seating load of an occupant is applied. A seating sensor is disposed within the seat cushion for detecting a seating position of the occupant. The seating sensor is configured as a push-in switch and can detect the seating position of the occupant when the seating sensor is pressed by the cushion pad. A fragile region is interleaved between the seating sensor and the cushion pad at a pressure receiving region where the pressing force is applied to the seating sensor. The fragile region has rigidity lower than the cushion pad.