To provide an organic polymer which is excellent in thermal resistance and chemical resistance and has a low permittivity.

The polyether resin comprises the repeating unit expressed by formula (1) [wherein R1 through R3 are each independently a hydrogen atom, a halogen atom or an optional substituent, and any two groups of them may bind to thereby form a ring; R4 is a hydrogen atom, a 1-10C (substituted) alkyl group, a 6-10C (substituted) cycloalkyl group, a group having a 6-14C (substituted) aromatic ring, a (substituted) trialkylsilyl group or a hydroxyalkyl group; and Ar is a divalent group having an aromatic ring].