An optical wave guide device is manufactured by bonding an optical wave guide to an optical modulator through an upper cladding layer. The present inventors have conducted extensive studies to solve the above-described problems, and as a result, they have found a photo-curable resin composition which comprises a cationic photopolymerization initiator, a cationically polymerizable compound, a cyclic polyether compound and another organic compound, wherein the amount of is 1. , wherein the ion is Li+, H+, Cu+, Ag+, Na+ or Mg2+. The gantry assembly is configured to be supported by the continuous belt, during movement of the gantry over a work table surface when crossing the space between work table surfaces.