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In the formulae, Ar$_{1}$ a represents an arylene group which is the same as that described above for X$_{1 }$to X$_{3 }$ in formulae (III) 45 to (VII). 

Each of Ar$_{2}$a to Ar$_{4}$ a represents an aryl group which is the same as that described above for R$_{201 }$to R$_{203}$ , R$_{204 }$ and R$_{205 }$ in formulae (ZI) to (ZII). 

Roi represents a hydrogen atom, a methyl group, a chlo› romethyl group, a trifluoromethyl group or a cyano group. 

Each of R$_{02 }$and R$_{021 }$represents a single bond, an arylene group, an alkylene group, a cycloalkylene group, ---0-, -S0$_{2}$ -, CO-, -N(R$_{33}$)-, or a divalent linking group formed by combining a plurality thereof, which are the same as those described above for X$_{1 }$ to X$_{3 }$ in formulae (III) to (VII). 

Each ofR$_{03 }$and R$_{019 }$ independently represents a hydrogen 60 atom, an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group. Examples of these groups are the same as those described above for R$_{25 }$in formula (IV). 

The repeating unit preferred as the repeating unit (R) fur- ther includes a repeating unit represented by any one of the following formulae (I-7) to (I-34): 

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