Abstract: This invention provides a semiconductor laser device that can be accurately and easily coupled with a optical waveguide device, a method of manufacturing such a semiconductor laser device and a method of coupling such a semiconductor laser device and a optical waveguide device. A semiconductor laser device according to the invention is provided with a stripe-shaped groove that is referred to for accurately locating its light-emitting section. A method of manufacturing a semiconductor laser device according to the invention comprises steps of forming a stripe-shaped light-emitting section, a stripe-shaped nonlight-emitting section and a stripe-shaped reference groove on a semiconductor substrate. With a method of coupling a semiconductor laser device and an optical waveguide device according to the invention, the light-emitting section of the semiconductor laser device is aligned with the optical waveguide device by referring to the stripe-shaped reference groove.