Seat back of a vehicle seat and vehicle seat having such seat back

A seat back of a vehicle seat (10) having a substantially rigid seat back frame (14) and a cover (16) surrounding the seat back frame (14), comprising

• a full-surface seat back center part (22) extending substantially perpendicularly to the sitting direction (24) in the transverse direction (26) of the seat back,
• two seat back frame sides (28) opposed in the transverse direction (26) of the seat back which laterally delimit the seat back (1) and are transformed into the seat back center part (22),
• an airbag module (30) accommodated in the cover (16) of one of the seat back frame sides (28) and mounted to the seat back frame (14) which airbag module comprises an inflator (40) and a spirally folded airbag (34),
• wherein in the area of the seat back frame side (28) the seat back frame (14) has a contact surface (32) adjacent to the spirally folded airbag (34) and extending substantially obliquely forward away from the seat back center part (22) related to the sitting direction (24) so that the contact surface (32) includes an angle (α) of 10°<α<45° with the sitting direction (24),
• wherein the airbag (34) extends substantially obliquely forward away from the seat back center part (22) starting from the inflator (40) and related to the sitting direction (24) and is wound spirally inwardly toward the contact surface (32) and away from the seat back center part (22), and
• wherein the spirally wound airbag (34) deploys by unwinding toward the contact surface (32) which directs the unwinding airbag (32) in a main deployment direction (36), the main deployment direction extending parallel to the contact surface (32) and substantially toward a tear seam (42) provided in the cover (16).