In obtaining a laser light source module, a copper-based material is press-fit into a through-hole formed in a stem formed of an iron-based material to form a first heat sink, and a mount formed of a copper-based material is fixed on the first heat sink, and at least one semiconductor laser element is mounted on the mount. Meanwhile, by joining a second heat sink to the bottom face of the stem and the first heat sink, a desired mechanical strength can be easily obtained and the heat exhausting efficiency can also be improved. Moreover, the top face of the first heat sink is made flush with that of the stem and the bottom face of the first heat sink is located above the bottom face of the stem, facilitating the position adjustment of the semiconductor laser element in a direction perpendicular to the optical axis of a condensing optical system and the positioning of the semiconductor laser element in the optical axis direction of the condensing optical system, and at the same time, preventing a deviation between the optical axis of the condensing optical system and that of an optical element such as an optical fiber.