To provide an epoxy resin cured product in which an epoxy resin that does not accompany an increase in melting temperature or crystallization is used, has a glass transition temperature that represents heat resistance, is higher than ever, and is excellent in electrical insulation property.SOLUTION: An epoxy resin having a structure in which at least two glycidyl ether groups are bonded to a structure in which amidated phenolphthalein skeleton is dimerized is used. A desired epoxy resin cured product is obtained by the curing reaction of an epoxy resin composition containing said epoxy resin and a curing agent.SELECTED DRAWING: None
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