A swivel child car seat comprises a base having a bottom part, a disk-shaped swivel pedestal mounted on the bottom part of the base for free turning, and a seat body supported on the swivel pedestal. The swivel pedestal is fitted in a guide groove formed in the bottom part so as to move forwardly and rearwardly along the guide groove. The swivel pedestal is held fixedly in place by a block fitted in the guide groove.