Provided is the fluorene derivative represented in formula (1). (In the formula, R 1 and/or R 2 represents an alkoxy group, an alkenyloxy group, an alkynyloxy group, an aryloxy group, a heteroaryloxy group or an alkyl group that includes at least one ether structure, R 3 and R 4 represent a prescribed substituent, n 1 and n 2 are integers 0-3, and Ar 1 and Ar 2 represent a prescribed nitrogen-containing group.)