An optical module device includes an optical module having leads, a print substrate and a flexible substrate including a first region having a center and a peripheral areas, a second and a third region, the flexible substrate including first through-holes corresponding to the leads in the center area, a terminal and a metalized trace formed in the second and third regions respectively, and a protection layer formed on its surface at the peripheral area and in the third region, wherein the flexible substrate further includes two second through-holes in the peripheral area, which is a location close to the third region, wherein the flexible substrate is bent along a line coupling the two second through-holes, and wherein the flexible substrate at it first region is fixed to the second end member by adhesive material injected into the second through-holes.