An optical fiber array according to the present invention includes an optical coupling end face to be optically coupled to another optical line, and first ends of a plurality of optical fibers are arrayed in the optical coupling end face. The optical fiber array includes a lower plate (3a) having a plurality of V-shaped grooves (4) for positioning the optical fibers exposed from one end of a ribbon part of the optical fibers, and an upper plate (3b) for pressing each optical fiber provided in each V-shaped groove (4) of the lower plate into the positioning groove. A boundary portion between the ribbon part (7) and the optical fibers (1) is fixed between the first and second plates (3a, 3b) by heat resistant adhesive (10), and the optical fibers from the boundary portion to a front end of the array are fixed by solder (6) to achieve hermetic sealing.