Provided is a receptacle type LD module having few irregularities of output power between external optical fibers and few fluctuations of output power caused by a temperature change or a time elapse even when different external light fibers are detachably attached. An optical element (4) having polarization characteristic held on a rotationally symmetric joint sleeve (5) is arranged between a light emission/light collection unit formed by a light emitting element chip (LD) (2) and a lens (3), and a receptacle (9) which has a fiber stub (44) and detachably holds an external optical fiber. The positional relationship between the light emission/light collection unit and the fiber stub (44) is appropriately adjusted. The joint sleeve (5) and the optical element (4) having polarization characteristic are rotated as a unitary block so as to obtain a rotation angle (theta c or theta d) at which a desired light amount (Ec or Ed) to the external optical fibers can be obtained. At the angle, the joint sleeve (5), the light emission/light collection unit, and the receptacle (9) are welded together.