A semiconductor laser device that can be operated at high power and that has a structure which can suppress kink, reduce loss and stabilize the direction of polarization simultaneously, and in which an optical pattern decreases monotonously as receding from an active layer and the crystal composition can be easily controlled. A plurality of layers of high refractive index different in the composition from that of the cladding layer are introduced being dispersed over a range wider than the spot size for directing light closer to the lower cladding layer of the semiconductor laser and stabilizing the direction of polarization. The electric field intensity is decreased monotonously as receding from the active layer for the optical pattern.