To constitute a child seat so as not to take a very large space when detached from a vehicle seat.

This child seat is provided with a seat part 1 provided with hip supports 7, and a backrest part 2 provided with head supports 10. The backrest part 2 is constituted to be operable to fall onto the seat part 1 side around a rear fulcrum P1 of the seat part 1. To prevent the mutual interference of the heat supports 10 and hip supports 7, the hip supports 7 are provided at the rear right and left parts of the seat part 1, and the head supports 10 are provided at the upper right and left parts of the backrest part 2. The backrest part 2 is constituted to be operable to fall into a housed attitude along the seat part 1.