Motor car chair for a child

A motor car chair (1) for a child, mounted on a motor car seat (2), comprising a base (3) where clamping catches (13) and a shell bottom seat (3) are positioned. The bottom seat (3) comprises internal belts (5) for a child said belts having two shoulder segments extending within the space of the bottom seat (4) intended for a child and passing to the other side of the bottom seat (4) and there being linked with a tensioning belt (6) that passes through a tensioner (7), and in the space of the bottom seat (4) intended for a child a connecting crotch element (10) provided with a clamp (11) for internal belts (5). A fastening part of a connecting crotch element (10) is provided with a handle (12) positioned at the opposite side of the bottom seat (4) than a side of the bottom seat (4) intended for a child, and the tensioner (7) of the belts (5) of the chair (1) is provided with a connector (9), where the handle (12) of the fastening part of the connecting crotch element (10) and the connector (9) of the tensioner (7) are coupled with clamping catches (13) of the base (3) of the chair (1) upon setting of the bottom seat (4) on the base (3).