A child car seat (10) includes a child-car-seat body (15) includes a seat part (40) having a seat plate part (41) and a back plate part (45), a sliding member (60) located on a position opposed to the back plate part from a front side, the sliding member being slidable with respect to the back plate part so as to move in a height direction, and a child belt disposed on the child car-seat body. The sliding member (60) has a through-hole (66) through which the child belt (30) can pass. The back plate part has, at a position opposed to the through-hole, an elongate hole (66) extending in a sliding direction of the sliding member with respect to the back plate part.