To improve the cutting quality and the sense of use while dispensing with the decrease in the reciprocation distances of an oscillator and a cutter by suppressing noise caused by the reciprocation of the oscillator and suppressing vibrations of a foil and a body part.

This reciprocating electric shaver where the cutter 54 reciprocates while coming into slide contact with the inner face of the foil 10 having an approximately inverse-V-shape in the side view, is provided with the body part 14 incorporating a motor 16 and retaining the foil 10 in its upper part, the oscillator 30 retaining the cutter 54 while pushing it toward the inner face of the outer blade 10 and reciprocating, a guide part 34 provided in either one of the body part 14 or the oscillator 30 and guiding the oscillator 30 in the reciprocating direction of the cutter 54, and a driving part 38 reciprocating the oscillator 30 by the motor 16.