A vehicle seat that is equipped with a side airbag device includes: an airbag package that includes a side airbag that is housed within a side portion of a seatback; a seatback skin at which a burst line portion receives inflation pressure of the side airbag and breaks; and a seatback pad in which a vertical slit portion, that is positioned further toward a seat transverse direction outer side than a front edge portion of the airbag package, extends toward upper and lower sides of the side portion along the front edge portion. The side airbag inflates and expands with passing-through the vertical slit portion, and an upper end of the vertical slit portion is positioned further toward a seatback rear side than a lower end of the vertical slit portion.