A laser assembly includes a plurality of laser light sources, a plurality of laser light source bases having main surfaces on which the laser light sources are placed and arranged apart from each other, an optical waveguide layer having at least an optical waveguide configured to guide laser light output from the laser light sources, an optical waveguide substrate having a main surface on which the optical waveguide layer is provided, and a plurality of metal films (M) configured to bond the laser light source bases with the optical waveguide substrate. The plurality of metal films (M) correspond to the plurality of laser light source bases and are arranged apart from each other.