A vehicle seat including: a seat cushion, a cushion frame; and a pair of slide rails on which the cushion frame is mounted and which is configured to support the cushion frame to be slidable relative to a floor, each slide rail including an upper rail, wherein two engaging portions are respectively provided to the upper rails, wherein four fitting portions which abut against and fit into the engaging portions are provided to the cushion frame, wherein each of the fitting portions includes at least two wall portions extending in a vertical direction, and wherein guide portions are provided at lower sides of the wall portions, the guide portions being configured to guide the fitting portions to be fitted into the engaging portions when the cushion frame comes close from above to the upper rails mounted on the floor.