Abstract: A child car seat is adapted for use in an automobile, and includes a seat assembly and a backrest unit connected to the seat assembly and including a backrest body, a pair of safety belts, and a guide component. The backrest body has opposite front and rear surfaces, and a plurality of spaced apart pairs of belt slots. Each belt slot has opposite front and rear open ends formed respectively in the front and rear surfaces. Each safety belt has a free end portion. The guide component is coupled to the rear surface of the backrest body and covers the rear open ends of the belt slots. The free end portions of the safety belts are extended respectively through a selected one pair of the belt slots, and along a predetermined route behind the rear surface of the backrest body through guidance of the guide component.