Multi-fiber optical ferrule, multi-fiber optical connector, and production method for multi-fiber optical ferrule

The purpose of the present invention is to provide a multi-fiber optical ferrule and a multi-fiber optical connector which have connection compatibility with conventional optical connectors. A multi-fiber optical ferrule 100 comprises: a main body which comprises a resin composition; a plurality of optical fiber insertion holes 103 which are provided in the main body and into which optical fibers 11 are inserted; and two guide pin holes 102 which are provided in the main body and into which guide pins are inserted, wherein the optical fiber insertion holes comprise not less than 24 holes and are provided on a straight line connecting the two guide pin holes, the optical fiber insertion holes have a small diameter part 110 and a large diameter part 106, the internal diameter of the small diameter part is 81 [mu]m, and the pitch Pm for optical fiber insertion holes at the center part is twice the pitch P for optical fiber insertion holes other than those at the center part.