A light therapeutic device for an affected part is provided. The light therapeutic device includes an optical element providing light with at least one specific wavelength for treatment of the affected part. When the optical element contacts the affected part, the optical element has a shape corresponding to the shape of the affected part.一種光治療裝置,用於治療一患部,包括一光學元件,該光學元件提供具有至少一特定波長的光線用於治療患部,其中當該光學元件接觸於該患部時,該光學元件具有與該患部相似的形狀。10‧‧‧光學元件20‧‧‧光耦合器30‧‧‧導光管40‧‧‧光耦合器50‧‧‧光源90‧‧‧反射層100‧‧‧光治療裝置