An optical connector includes a first connector and a second connector configured to be mated to the first connector. The first connector includes a plate having an opening, a substrate stacked on the plate, and an adapter having an opening and connected to the plate. The second connector includes a housing and a ferrule configured to connect to an optical fiber. The ferrule is provided in the housing to project from the housing to have an end of the ferrule exposed outside the housing. The ferrule is inserted in the openings when the first connector and the second connector are mated together.