Apparatus is disclosed for removing a coating from synthetic resin products, such as an automobile bumper, to obtain improved coating removal rate and improved productivity. A resin material (Wb) having a coating (Wc) applied thereto is rolled between a resin-side roll (11) and a coating-side roll (12) which rotate at different peripheral speeds. A shear stress is applied to the interface between the resin material (Wb) and the coating (Wc), thereby removing the coating from the resin material. Pressing means (41) press the coating-side roll (12) towards the resin-side roll (11) with a predetermined force. The resin-side roll (11) and the coating-side roll (12) apply a normally fixed shear stress between the resin material (Wb) and the coating (Wc), ensuring stable coating removal and improved productivity.