the present invention is a photosensitive resin composition for an optical waveguide containing an aliphatic-based resin and a photopolymerization initiator having a polymerizable substituent, an aliphatic-based resin having a polymerizable substituent group, the side chain functional aliphatic resin (a) and two long-chain functional relates to a photosensitive resin composition for an optical waveguide comprising the aliphatic resin (B). Therefore, it is high transparency, and combined with a good roll, roll-to-fit, high resolution patterning Province, Chengdu also has excellent flow down. Therefore, the material for forming the optical waveguide, is particularly useful as a core layer forming material.
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