Curable composition

A curable composition comprising:

• a compound A represented by Formula (A) and at least one compound X selected from the group consisting of compounds represented by Formulae (X1) to (X4), in which a content of the compound X is 0.01 to 2.0 mass % with respect to a total mass of the compound A and the compound X;
• or
• a compound B represented by Formula (B) and a compound Y represented by Formula (Y), in which a content of the compound Y is 0.01 to 2.0 mass % with respect to a total mass of the compound B and the compound Y,
• wherein in Formula (A) and Formulae (X1) to (X4), R1 represents a hydrogen atom or a methyl group, m represents an integer of 2 to 4, n represents an integer of 2 to 4, k represents 0 or 1, and a plurality of R1's and a plurality of m′s may be the same as or different from each other, and
• in Formula (B) and Formula (Y), R2 represents a hydrogen atom or a methyl group, R3 represents —CH2CH(R2)CH2— or —CH2CH2—, s represents 1, q represents 0 or 1, p represents an integer of 2 to 6, and a plurality of R2's, a plurality of R3's, and a plurality of p's may be the same as or different from each other.