Child safety seat and support base thereof

A support base for a child safety seat includes a shell body for supporting a child seat, a foot and a recline actuator. The shell body has a first and a second end opposite to each other, an upper surface facing upward, and an end surface extending generally vertical at the first end. The foot is disposed at a bottom of the shell body adjacent to the first end, and is movable to adjust an inclination of the support base. The recline actuator is connected with the shell body, and can engage with the foot to lock the foot in position. The recline actuator has at least an actuating portion exposed on the upper surface, the actuating portion being operable to cause an unlocking movement of the recline actuator for disengaging the recline actuator from the foot.