Phenolic resin, epoxy resin, epoxy resin composition and cured product of same

A phenolic resin represented by General Formula (1) below:

• in the formula, R1's each independently represent a hydrocarbon group having 1 to 8 carbon atoms;
• R2's each independently represent a hydrogen atom, Formula (1a), or Formula (1b) below, where at least one of R2's is Formula (1a) or Formula (1b);
• and n represents the number of repetitions, where an average value thereof is a number of 0 to 5,
• wherein the resin is obtained by reacting dicyclopentadiene, in a ratio of 0.28 to 1 times by mol, or in a case where dicyclopentadiene is sequentially added in separate stages and reacted, an overall ratio thereof of 0.8 to 2 times by mol and a ratio of dicyclopentadiene used at each stage of 0.28 to 1 times by mol, with 2,6-disubstituted phenols represented by formula (3), at a temperature of 50 to 200° C.,
• wherein R1 is as defined in General Formula (1),
• and wherein the resin has a peak near 3040 cm−1 in FT-IR measurement.