To provide a child carrying push-car, a modular support system and a component.

This push-car for carrying at least one child includes a chassis with a wheel including a chassis frame and a plurality of wheels and an occupant support for supporting the child. The plurality of wheels are rotatably arranged to the chassis frame for supporting the chassis frame on the ground surface, and can move the chassis with a wheel along the ground surface. For supporting the occupant support substantially above the chassis with a wheel, the occupant support can be installed to the chassis frame in a mounting position by a single tool unnecessary installation mechanism for installing its bottom surface to the chassis frame.