The child safety seat (1) for a vehicle in accordance with the invention comprises an outer shell (2) enclosing a seating area (3) for a child (4) and a protective element (5). The protective element (5) comprises a housing component (7) and an impact component (8), wherein the housing component (7) is embedded into the outer shell (2) and the impact component (8) is mounted to the housing component (7), is configured to be enclosed at least partially by the housing component (7), and is configured to protrude laterally from the outer shell (2) in a direction facing away from the seating area (3). Preferably, the housing component (7) or the impact component (8) comprises a deformable region (9) adapted to cushion forces impacting on the impact component (8).