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. <EOS>