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This paper describes the harmonic characteristics of 40W-fluorescent lamp operating circuit with a leakage transformer. The research has been carried out in the following sequence. First, as source voltage is varied, Fourier series are derived on voltage and current waveforms at each element of the operating circuit. Then, by using the Fourier expansion, each harmonic component at each element of the operating circuit is obtained, from experimental waveforms. The following are clarified from the research.(1) A vector diagram is obtained for each harmonic and their characteristics are clarified.(2) The impedance (its resistance and reactance component) is obtained for each harmonic, and their characteristics are clarified.(3) The equivalent circuit is obtained for each harmonic, and their characteristics are clarified.(4) The following is revealed. There exists 'giving and receiving' of active and reactive power of each harmonic between the 40W-fluorescent lamp and the secodnary winding of the leakage transformer. And their characteristics are clarified.