An optical connector and lens block connecting structure includes a substrate, an optical element, a lens frame including two side ribs, and a fore rib, a lens block for bending the optical path of the optical element to convert into an optical path parallel to the substrate, an optical connector provided at a fore end of an optical fiber cable, an optical connector frame including two side ribs and a rear rib, and an elastic member interposed between the rear rib of the optical connector frame and the optical connector. The optical connector frame is fixed to the substrate such that the optical connector is mounted to the lens block while the rear rib of the optical connector frame allows the elastic member to press the optical connector toward the lens block.