An electric hair cutter comprising: an electric motor including an output shaft; a motion conversion mechanism that converts rotary motion of the output shaft into reciprocating linear motion; and a movable blade driven by the reciprocating linear motion transmitted from the motion conversion mechanism, wherein the motion conversion mechanism includes a first conversion portion, a second conversion portion, and an output portion, the first conversion portion converts the rotary motion of the output shaft into reciprocating rotary motion about a first axis, wherein the first axis intersects with a direction parallel to the output shaft, the second conversion portion converts the reciprocating rotary motion into the reciprocating linear motion, the output portion couples the second conversion portion to the movable blade so that the movable blade performs the reciprocating linear motion, the second conversion portion includes a motion transmission part, which couples the first conversion portion to the output portion, and an elastic deformation part, the elastic deformation part is coupled to the motion transmission part to restrict motion of the motion transmission part caused by motion components that are contained in the reciprocating rotary motion, which is transmitted from the first conversion portion to the motion transmission part, and differ from a motion component in an output direction, which is a direction of the reciprocating linear motion, so that the motion transmission part performs the reciprocating linear motion caused by the motion component of the output direction, characterized in that the motion conversion mechanism further includes a turning pair that couples the second conversion portion to the output portion, and the turning pair includes a rotation shaft having a second axis intersecting with the output direction, and a coupling portion coupled to the rotation shaft to allow the second conversion portion and the output portion to relatively rotate about the second axis. an electric motor including an output shaft; a motion conversion mechanism that converts rotary motion of the output shaft into reciprocating linear motion; and a movable blade driven by the reciprocating linear motion transmitted from the motion conversion mechanism, wherein the motion conversion mechanism includes a first conversion portion, a second conversion portion, and an output portion, the first conversion portion converts the rotary motion of the output shaft into reciprocating rotary motion about a first axis, wherein the first axis intersects with a direction parallel to the output shaft, the second conversion portion converts the reciprocating rotary motion into the reciprocating linear motion, the output portion couples the second conversion portion to the movable blade so that the movable blade performs the reciprocating linear motion, the second conversion portion includes a motion transmission part, which couples the first conversion portion to the output portion, and an elastic deformation part, the elastic deformation part is coupled to the motion transmission part to restrict motion of the motion transmission part caused by motion components that are contained in the reciprocating rotary motion, which is transmitted from the first conversion portion to the motion transmission part, and differ from a motion component in an output direction, which is a direction of the reciprocating linear motion, so that the motion transmission part performs the reciprocating linear motion caused by the motion component of the output direction, characterized in that the motion conversion mechanism further includes a turning pair that couples the second conversion portion to the output portion, and the turning pair includes a rotation shaft having a second axis intersecting with the output direction, and a coupling portion coupled to the rotation shaft to allow the second conversion portion and the output portion to relatively rotate about the second axis.