An outer cutter of a reciprocating type electric shaver in which an inner cutter makes sliding contact with an inside surface of a curved portion of the outer cutter, the curved portion being formed by bending a thin metal plate, which has numerous hair entry apertures, into a curved shape; and the curved portion being provided at both ends thereof with blocking portions that cover both ends of a space defined by the curved portion so as to prevent cut hair from being discharged to outside of the outer cutter, the blocking portions being formed integral with the curved portion.