Resin composition, molded body, optical lens, and optical lens unit

An optical resin composition comprising:

• a resin having a structural unit represented by Formula (1) below;
• and
• a binaphthalene compound having a structure represented by Formula (2) below and/or an oligomer thereof:
• (in Formula (1),
• A represents a C1-C5 alkylene group,
• p represents 0 or 1,
• K1 represents a hydrogen atom or a C1-C5 alkyl group,
• K2 represents a hydrogen atom, a C1-C5 alkyl group or a C6-C20 aryl group,
• Z each independently represent a carboxyl group, an alkoxycarbonyl group, a cycloalkyloxycarbonyl group, an aryloxycarbonyl group, a hydroxyalkylcarbonyl group, a glycidyloxycarbonyl group, a cyano group or an amide group, and
• q represents 0 or 1);
• and
• (in Formula (2),
• R1-R10 each independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a C1-C6 alkyl group, a C6-C20 aryl group which may contain a heterocyclic atom selected from O, N and S, a C2-C10 alkenyl group, a C2-C10 alkynyl group, a C1-C6 alkoxy group or a C7-C17 aralkyl group, provided that the alkyl group, the aryl group, the alkenyl group, the alkynyl group, the alkoxy group and the aralkyl group may be substituted with a cyano group, and that the alkyl group, the alkenyl group, the alkynyl group, the alkoxy group and the aralkyl group may be substituted with a phenyl group,
• X each independently represent a C1-C8 alkylene group, a C5-C12 cycloalkylene group or a C6-C20 arylene group, and
• a and b each independently represent an integer of 1-10);
• wherein the ratio of Mass A of the resin having a structural unit represented by Formula (1) to Total mass B of the binaphthalene compound represented by Formula (2) and the oligomer thereof is A/B (mass ratio)=99/1−80/20.