A vehicle seat is provided with: a seat cushion; and a seat back. The seat back includes: a seat pad; a reinforcing member that is formed by a linear or planer member and reinforces the seat pad; and an accommodating section provided in the seat pad and receives an installable component that is configured as a separate body that is separate from the seat back. The reinforcing member has an engaging portion that protrude into the accommodating section, the engaging portion being configured to be engageable with an engaged portion that is provided on the installable component. The vehicle seat is configured to allow the installable component to be installed in the accommodating section while positioning the installable component with respect to the accommodating section in a state where the engaging portion and the engaged portion are engaged with each other.