To provide a low-cost electric razor having a smart shape in appearance.

This electric razor has an operation conversion mechanism D and an advance/retreat rod 46 reciprocated by the operation conversion mechanism D, on a main shaft A side. The advance/retreat rod 46 and an engagement rod 47 on a head B side are detachably engaged with each other. Because the head B side does not have the operation conversion mechanism D, the number of components on the head B side is drastically reduced. Because an individually-replacing head B does not similarly require the operation conversion mechanism D and requires only the engagement rod 47 engaging with the advance/retreat rod 46 on the main shaft A side, a cost is reduced. Because a base part of the head B can be slimmed to form the electric razor in the smart appearance.