An aromatic amine compound represented by the following formula (a1): wherein, in the formula (a1), R 1a , R 1b , R 2a R 2b , R 3a , and R 3b are each independently a monovalent hydrocarbon group, a group represented by -OR 4a , a group represented by -SR 4b , an acyl group, an alkoxycarbonyl group, a halogen atom, a cyano group, a group represented by -NHR 4c , or a group represented by -N(R 4d ) 2 , wherein the monovalent hydrocarbon group, the group represented by -OR 4a , the group represented by -SR 4b , and the acyl group, the alkoxycarbonyl group, the group represented by - NHR 4c , and a group represented by -N(R 4d ) 2 may be substituted by one or more groups selected from the group consisting of a group represented by -OR 4e , a group represented by -SR 4f , an acyl group, an alkoxycarbonyl group, a halogen atom, a cyano group, and a group represented by -NHR 4g ; R 4A to R 4g are each independently a monovalent hydrocarbon group; X 1 and X 2 are each independently -CO-NH-, -CO-NH-CO-, -O-CO-NH-, or - CO-NH-CO-NH-; a ring Y 1 , a ring Y 2 , a ring Y 3 , and a ring Y 4 each independently represent an aromatic hydrocarbon ring; R is a single bond, a methylene group which may have a substituent, an ethylene group which may have a substituent and including a heteroatom between two carbon atoms, a group represented by -O-, a group represented by -NH-, or a group represented by -S-; n1 and n2 are each independently an integer of 0 or more and 4 or less; n3 and n4 are each independently an integer of 0 or more and 5 or less; n5 and n6 are each independently an integer of 0 or more and 4 or less; n7 and n8 are each independently an integer of 0 or more and 2 or less; n3+n7 and n4+n8 are each independently an integer of 0 or more and 5 or less; and n7+n8 is an integer of 1 or more and 4 or less. wherein, in the formula (a1), R 1a , R 1b , R 2a R 2b , R 3a , and R 3b are each independently a monovalent hydrocarbon group, a group represented by -OR 4a , a group represented by -SR 4b , an acyl group, an alkoxycarbonyl group, a halogen atom, a cyano group, a group represented by -NHR 4c , or a group represented by -N(R 4d ) 2 , wherein the monovalent hydrocarbon group, the group represented by -OR 4a , the group represented by -SR 4b , and the acyl group, the alkoxycarbonyl group, the group represented by - NHR 4c , and a group represented by -N(R 4d ) 2 may be substituted by one or more groups selected from the group consisting of a group represented by -OR 4e , a group represented by -SR 4f , an acyl group, an alkoxycarbonyl group, a halogen atom, a cyano group, and a group represented by -NHR 4g ; R 4A to R 4g are each independently a monovalent hydrocarbon group; X 1 and X 2 are each independently -CO-NH-, -CO-NH-CO-, -O-CO-NH-, or - CO-NH-CO-NH-; a ring Y 1 , a ring Y 2 , a ring Y 3 , and a ring Y 4 each independently represent an aromatic hydrocarbon ring; R is a single bond, a methylene group which may have a substituent, an ethylene group which may have a substituent and including a heteroatom between two carbon atoms, a group represented by -O-, a group represented by -NH-, or a group represented by -S-; n1 and n2 are each independently an integer of 0 or more and 4 or less; n3 and n4 are each independently an integer of 0 or more and 5 or less; n5 and n6 are each independently an integer of 0 or more and 4 or less; n7 and n8 are each independently an integer of 0 or more and 2 or less; n3+n7 and n4+n8 are each independently an integer of 0 or more and 5 or less; and n7+n8 is an integer of 1 or more and 4 or less. <EOS>