BIDIRECTIONAL OPTICAL TRANSMISSION MODULE

PROBLEM TO BE SOLVED: To enhance workability without imparting a degree of freedom when a light-emitting and light-receiving element is accommodated and unreasonable bending when soldering the light-emitting and light-receiving element, and simplify fixing of the casing. SOLUTION: A lower casing 1 is formed with a synthetic resin, etc., and provided with an accommodating hole 3 of a light-emitting and light-receiving element 2, an optical connector fitting part 4, a hybrid IC substrate 5, a hybrid IC substrate accommodating slit 6, a stopper 7, and an upper casing projection accommodating hole 8. And, the light-emitting and light-receiving element 2 is accommodated in the accommodating hole 3 so that a signal terminal 8 is set to an upper direction. The hybrid IC substrate 5 is slid from rearwardly along the hybrid IC substrate accommodating slit 6 and accommodated therein. Furthermore, it comes into contact with the stopper 7 and is held so that it does not slide to more frontwardly. The light-emitting and light-receiving element 2 is solder-connected to the hybrid IC substrate 5 in a solder part.