a photosensitive composition for optical waveguides comprising of an organic oligomer , a polymerization initiator and a crosslinking agent , the organic oligomer being a silicone oligomer represented by the following formula , wherein x denotes hydrogen , deuterium , halogen , an alkyl group or an alkoxy group ; m is an integer from 1 to 5 ; x and y represent the proportion of respective units , and neither x nor y is 0 ; and r 1 denotes a methyl , ethyl , or isopropyl group ; a production method thereof , and a polymer optical waveguide pattern formation method using the same .