To provide an optical transmission module, capable of reinforcing the connection of an optical fiber array to an optical device with minimum loss of light and a method of manufacture the same in the optical transmission module, having the optical device in which an optical circuit is formed and an optical connection means of connecting the optical fiber to the optical device, and to provide a method for manufacturing the same.

The optical transmission module, having the optical device (30) in which the optical circuit (33) is formed and the optical connection means (21, 22) for connecting the optical fiber (11, 12, 13) to the optical device (30), has reinforcing means (111, 112, 211, 212, 221, 222, 311, 312, 321 and 322) filled into a part or the whole of the periphery of the connection part of the optical device (30) and the optical connection means (21, 22) and is hardened to reinforce the coupling of the optical device (30) to the optical connection means (21, 22).