A linear motor is arranged to have two legs each of which have a different resonance frequency, when one of the legs is induced to resonate by applying a vibration having a frequency which corresponds to the resonance frequency of one of the legs, to the chassis of the motor, the motor proceeds in a first direction, while when a vibration having a second frequency which corresponds to the resonance frequency of the other leg is applied, the motor is propelled linearly in the other direction.