A detachable vehicle seat for children having a base and a backrest pivotally connected together by a connection mechanism. The connection mechanism includes a transverse latching bar and a restriction tab in the back of the seat. A cross-section of the latching bar has a short edge and a long edge, and the restriction tab has vertical receiving slots and apertures of differing heights. During assembly, the short edge of the latching bar is inserted into said apertures and restricted by its long edge from moving backwards, thereby preventing the bar from coming off of the receiving slots, thereby simplifying assembly or disassembly of the seat.