An optical transmission connector device includes: a transmission-side connector sending optical signals; and a reception-side connector receiving the optical signals sent from the transmission-side connector. The transmission-side and the reception-side connectors have: optical fibers transmitting optical signals; and optical members disposed in contact with or in the vicinity of one end surfaces of the optical fibers. The optical member of the transmission-side connector is formed so as to convert the optical signals emitted from the one end surfaces of the optical fibers into approximately parallel beams of light and so as to cause the centers of light beams of the approximately parallel beams of light to intersect at approximately one point. The optical member of the reception-side connector is formed so as to cause the optical signals converted into the approximately parallel beams of light at the optical member of the transmission-side connector to enter the separate optical fibers.