A vehicle seat includes a side frame of a seat cushion having a side frame opposing portion extending in a front-rear direction of the seat cushion, and a bracket member disposed below the side frame having a bracket opposing portion extending in the front-rear direction and opposing the side frame opposing portion. The side frame opposing portion and the bracket opposing portion are provided such that the side frame opposing portion and the bracket opposing portion come in contact with each other in a state in which the seat cushion sinks rearward and downward when a load acted on the vehicle seat from behind is transmitted to the seat cushion from the seat back via a connection part. An arrangement interval between the bracket opposing portion and the side frame opposing portion is smaller in a front side than in a rear side in the front-rear direction.