A structure for deploying a side airbag installed in a seat of a vehicle is provided. The structure includes an interior pad is disposed adjacent to a first side of a side airbag and an exterior portion surrounded by an interior covering. An exterior pad is disposed adjacent to a second side of the side airbag and has an exterior portion surrounded by an exterior covering. An interior reinforcing fabric penetrates a pad aperture portion formed between the interior pad and the exterior pad and surrounds a first side of the side airbag. An exterior reinforcing fabric is integrally coupled to the exterior covering and surrounds the exterior portion of the exterior pad. The interior reinforcing fabric is spaced apart from the interior covering and disposed in a path different from a path of the interior covering. The collision performance is easily adjusted and production costs and weights are reduced.