A reclining apparatus for a rear seat in a car may include a plurality of links provided on both sides of a cushion frame and each being rotatably coupled at both sides to the cushion frame or a car floor, and a locking module configured to couple a back frame hinge-connected to the cushion frame with a car body and slidably and rotatably connected with the back frame so as to allow the back frame to tilt at a variable angle in response to movement of the cushion frame by the rotation of the links.