A reciprocating electric shaver in which a plurality of elongated cutter blades (122) of an arch-form inner cutter (102) make a reciprocating motion while making sliding contact with an arch-form outer cutter (100) that has a hair introduction openings, so that hair introduced into the hair introduction openings is cut by the cutter blades (122), wherein the inner cutter (102) is formed by bending into an arch shape a thin plate in which a pair of side edge portions (120) that are parallel to the reciprocating direction of the inner cutter and a plurality of cutter blades (122) that are connected at both ends to the side edge portions (120) are integrally formed, and at least a part of each one of the cutter blades is bent with respect to the direction of length of the cutter blades.