To easily produce a high accuracy optical fiber array.

A coated fiber part retaining plate 18 which is shorter than the length of many parallel V-grooves 12 is placed on a V-grooved substrate 10 formed with these V-grooves on the surface and is temporally fixed in a tight contact state thereto. A UV-curing adhesive 20 of a low viscosity is then applied near a coated fiber part retaining plate 18 on the V-grooved substrate 10 and respective coated fibers 24 of a tape-like optical fiber 22 are inserted therein, until the fibers pass through the inside of the V-grooves 12. The exposed V-grooves 12 and the front end portion of the coating part 26 of the tape-like optical fiber are coated with the optical fiber retaining member 28, and thereafter the adhesive 20 is cured through irradiation with UV rays.