Optical module and optical connector cable

An optical module comprising:

• a substrate;
• a plurality of optical elements mounted on the substrate;
• and
• a plurality of lens modules each having an outer surface and an inner surface facing each other and a lens provided on the inner surface, the plurality of lens modules optically coupling optical fibers and the plurality of optical elements through each lens, respectively,
• wherein each of the plurality of lens modules is mounted on the substrate such that the inner surface faces the substrate and is attached to the substrate with an adhesive introduced into a gap between the inner surface and the substrate, and
• an inflow prevention structure that prevents inflow of the adhesive to an optical axis of the lens is provided between the substrate and each of the plurality of lens modules and between the lens and the adhesive,
• wherein a plurality of cavities, each of which is recessed from a first surface of the substrate toward a second surface of the substrate so as to have a bottom portion, are formed in the substrate, and at least a part of each of the plurality of lens modules is accommodated in a corresponding one of the plurality of cavities,
• each of the plurality of cavities includes a first cavity having a first bottom portion and a second cavity having a second bottom portion,
• a distance between the second bottom portion and the second surface is smaller than a distance between the first bottom portion and the second surface, and
• the lens of each of the plurality of lens modules is accommodated in the second cavity of the corresponding one of the plurality of cavities.