The present invention provides a seat cover for a vehicle which is configured such that when a side airbag is initially deployed, an airbag can be smoothly guided in a lateral direction. The seat cover includes a front sheet, a rear sheet and a side sheet. A reinforcing fabric is provided on an inner surface of the front sheet. The side sheet is sewn at a first edge thereof to the front sheet and sewn at a second edge thereof to the rear sheet. A reinforcing liner is adhered or welded to an inner surface of the side sheet. The reinforcing fabric is less extensible or stretchable than the reinforcing liner.