A bifunctional phenylene ether oligomer of the formula (1), obtained by oxidation polymerization of a bivalent phenol of the formula (2) and a monovalent phenol of the formula (3), ##STR1##

    • (wherein —X— is represented by the formula (2), ##STR2##

      and Y—O— is represented by the formula (3), ##STR3##

    • R2, R3, R4, R8, R9, R10 and R11 in the formula (2) and the formula (3) being required not to be a hydrogen atom, and its use.

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