A reclining car seat hinge for a chair is disclosed. The hinge includes a pair of leaves having respective circular recesses formed with respective toothed peripheries, an annular planetary gear having a central hole defined therein and arranged in the circular recesses of the face-to-face leaves and engaged with the toothed peripheries of the recesses, a carrier ring rotatably pressed into the central hole of the annular planetary gear and having a central axis and an inner periphery coaxial with the central axis, an gear-shaft interlock arranged within the inner periphery and connected with the carrier ring in such a way that the carrier ring is movable but non-rotatable relative to the gear-shaft interlock, at least one spring having a first end connected to the carrier ring and a second end connected to the gear-shaft interlock, and a shaft extending through the leaves and non-rotatably connected to the gear-shaft interlock off center from the central axis of the carrier ring.