A polyphenylene ether comprising: a total of 100 mol% of a repeating unit derived from a phenol of Formula below and a repeating unit derived from a phenol of Formula below, wherein from 5 mol% to 85 mol% is the repeating unit derived from the phenol of Formula and from 15 mol% to 95 mol% is the repeating unit derived from the phenol of Formula, wherein, with respect to a total of 100 mol% of monomer units included in the polyphenylene ether, the sum of the repeating units derived from the phenol of Formula and the repeating units derived from the phenol of Formula, is 75 mol% or more, and a reduced viscosity (ηsp/c) measured in chloroform solution at a concentration of 0.5 g/dL at 30 °C is from 0.03 dL/g to 0.30 dL/g, as measured in the specification, in Formula, R 11 are each independently a saturated hydrocarbon group having 1 to 6 carbons that may be substituted, an aryl group having 6 to 12 carbons that may be substituted, or a halogen atom, and R 12 are each independently a hydrogen atom, a hydrocarbon group having 1 to 6 carbons that may be substituted, an aryl group having 6 to 12 carbons that may be substituted, or a halogen atom, in Formula, R 22 are each independently a hydrogen atom, a saturated or unsaturated hydrocarbon group having 1 to 20 carbons that may be substituted, an aryl group having 6 to 12 carbons that may be substituted, or a halogen atom, where two R 22 are not both hydrogen atoms, and R 21 is a moiety structure represented by Formula below, in Formula, R 31 are each independently a linear alkyl group having 1 to 8 carbons that may be substituted, or a cyclic alkyl structure having 1 to 8 carbons to which two R 31 are bonded, R 32 are each independently an alkylene group having 1 to 8 carbons that may be substituted, b are each independently 0 or 1, and R 33 is a hydrogen atom, an alkyl group having 1 to 8 carbons that may be substituted, or a phenyl group that may be substituted. a total of 100 mol% of a repeating unit derived from a phenol of Formula below and a repeating unit derived from a phenol of Formula below, wherein from 5 mol% to 85 mol% is the repeating unit derived from the phenol of Formula and from 15 mol% to 95 mol% is the repeating unit derived from the phenol of Formula, wherein, with respect to a total of 100 mol% of monomer units included in the polyphenylene ether, the sum of the repeating units derived from the phenol of Formula and the repeating units derived from the phenol of Formula, is 75 mol% or more, and a reduced viscosity (ηsp/c) measured in chloroform solution at a concentration of 0.5 g/dL at 30 °C is from 0.03 dL/g to 0.30 dL/g, as measured in the specification, in Formula, R 11 are each independently a saturated hydrocarbon group having 1 to 6 carbons that may be substituted, an aryl group having 6 to 12 carbons that may be substituted, or a halogen atom, and R 12 are each independently a hydrogen atom, a hydrocarbon group having 1 to 6 carbons that may be substituted, an aryl group having 6 to 12 carbons that may be substituted, or a halogen atom, in Formula, R 22 are each independently a hydrogen atom, a saturated or unsaturated hydrocarbon group having 1 to 20 carbons that may be substituted, an aryl group having 6 to 12 carbons that may be substituted, or a halogen atom, where two R 22 are not both hydrogen atoms, and R 21 is a moiety structure represented by Formula below, in Formula, R 31 are each independently a linear alkyl group having 1 to 8 carbons that may be substituted, or a cyclic alkyl structure having 1 to 8 carbons to which two R 31 are bonded, R 32 are each independently an alkylene group having 1 to 8 carbons that may be substituted, b are each independently 0 or 1, and R 33 is a hydrogen atom, an alkyl group having 1 to 8 carbons that may be substituted, or a phenyl group that may be substituted.