To prevent a cemented end surface of the optical waveguide module from being peeled when side pressure is applied.

This light guide module is equipped with a flat plate type light guide element 4 and optical fiber arrays 2 and 3 which are connected and fixed to both the end surfaces of the light guide element 4 and to which light is propagated through the light guide element 4 and those light guide element 4 and optical fiber arrays 2 and 3 are sectioned rectangularly; and a reinforcing member 14 which is fixed to at least two adjacent sides of the said rectangle is provided over the external surfaces of the light guide element 4 and optical fiber arrays 2 and 3.