There is provided an optical module including: a glass substrate that includes an optical-electric-conversion element, that is transparent to either one of light emitted from the optical-electric-conversion element and light received by the optical-electric-conversion element, and in which a locating hole is formed; and an optical component in which a locating pin is formed, the glass substrate and the optical component being positioned by fitting the locating pin to the locating hole through a protective film so that the protective film is in contact with the locating hole and the locating pin.