To restrain and prevent the occurrence of the dislocation of an optical fiber, and improve the positional accuracy thereof for an optical element.

This module is formed out of a substrate 2 having an optical element 5 laid thereon as well as a groove for laying an optical fiber 1 optically coupled to the optical element 5, and an optical fiber pressing lid body 3 mounted on the substrate 2. In addition, the lid body 3 has through-holes 4 reaching the optical fiber 1 across an optical fiber abutting surface and the opposite surface thereof, and is mounted on the substrate 2. A jointing material is fed from the through-holes 4 for fixing the optical fiber 1.