A seat apparatus equipped with a seat cover that covers at least part of the seat apparatus surface and is formed by sewing a plurality of skin material pieces together, an operation unit for receiving an operation from an operator, and a covering material for covering the operation unit, wherein: the covering material is formed as part of the skin material pieces, or is formed by sewing a member that is separate from the skin material pieces to the skin material pieces; and a projection is formed that projects in the outward direction from the seat cover when the operation unit is covered.