If time-varying magnetic field is induced to electric conductor like metal, eddy current is created within the electric conductor by Faraday's law. Electric conductibility of human body is far lower than highly-conductible materials like metals, but it still has substantial electricity conductibility. Accordingly, if the time-varying magnetic filed is induced to the body, eddy current will be created within the body like common electric conductor. Eddy current created in the body through non-contact method without direct electric current has the same treatment effect as the electric current which is introduced to the body through electrode