An optical fiber array for insertion-positioning and arranging coated optical fibers in a substrate, in which a plurality of through-holes are formed, wherein a coating of a tip of the coated optical fiber is removed to expose a optical fiber, and wherein with the use of three substrates, the optical fiber of the coated optical fiber is inserted into through-holes of the first and second substrates and is positioned, and the coating of the coated optical fiber is inserted into a through-hole of the third substrate and is positioned.