The present invention relates to a styryl polymer, represented by the following formula (I) or (II), a production method thereof and use thereof to a photosensitive member and a electroluminescence element: ##STR1## in which Ar.sub.11 is an arylene group which may have a substituent; Ar.sub.12 is an aryl group, a polycondensed ring group or a heterocyclic ring group; n.sub.1 is a natural number; ##STR2## in which Ar.sub.21, Ar.sub.22, and Ar.sub.24 are respectively an arylene group which may have a substituent; Ar.sub.25 is an arylene group or a bivalent polycondensed ring group, which may have a substituent; Ar.sub.23 and Ar.sub.26 are respectively an alkyl group, an aralkyl group or an aryl group, which may have a substituent; m.sub.2 is 0, 1, 2 or 3; n.sub.2 is a natural number.