Side impact protection device for a child safety seat in a car and a child safety seat

A side impact protection device for a child safety seat in a car, mounted on the outer surface of a safety seat (a), comprising:

• a base (1), fixedly connected to the safety seat (a);
• an adjustment assembly (2), movably disposed within the base (1);
• an anti-collision member (3), disposed on the base (1) via the adjustment assembly (2), and capable of adjusting the distance between the anti-collision member (3) and the base (1) via the adjustment assembly (2), thereby adjusting the distance between the anti-collision member (3) and the outer surface of the safety seat (a);
• characterized in that:
• The adjusting assembly (2) includes a knob (21) for applying external force and a screw (22) fixedly connected to the knob (21), the base (1) is provided with a screw hole (11) threadedly matched with the screw (22). The knob (21) can drive the screw (22) to rotate along the thread in the screw hole (11). The anti-collision member (3) is provided with a mounting hole (31). The adjusting assembly (2) is movably inserted into the mounting hole (31). An axial limiting structure is provided between the anti-collision member (3) and the adjusting assembly (2). When the external force drives the knob (21) to rotate and causes the screw (22) to rotate along the thread in the screw hole (11), the adjusting assembly (2) drives the anti-collision member (3) to translate axially outward or inward, thereby causing the anti-collision member (3) to move axially away from or close to the base (1).