Cyclic olefin-based resin composition, molded product, and optical component

A cyclic olefin-based resin composition comprising:

• a cyclic olefin-based polymer (A);
• and
• a hindered amine compound (Y) that contains a piperidyl group represented by General Formula (1) and a carboxylic acid amide group represented by General Formula (2) within the same molecule,
• wherein, in General Formula (1), X is a hydrogen atom, an oxyradical group, an alkyl group, an alkoxy group, an aryl group, or a hydroxy group, and R1 to R4 are each independently an alkyl group,
• wherein the hindered amine compound (Y) further contains an alicyclic structure represented by General Formula (3) within the same molecule,
• wherein, in General Formula (3), at least one of R400, R401, R402, R403, R404, or R405 is a bond, and except for the bond, remainders are each independently a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and g is equal to or more than 1 and equal to or less than 18.