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We propose a method for searching dark matter axion in axion-photon conversion. We consider a superconductor of cylindrical shape under strong magnetic field. The dark matter axion generates oscillating electric field which induces oscillating superconducting current in the surface of the superconductor. The current gives rise to dipole radiation with the frequency ma/2π given by axion mass ma. We show that the radiation flux generated by the current is of the order of 10−18 W under magnetic field ∼3 T in the case of radius 1 cm and length 10 cm of the cylindrical superconductor. The large amount of the radiation flux arises because Cooper pairs with large number density (∼1022/cm3) is present in the superconductor. With the high detection sensitivity, we can simultaneously search wide bandwidth of the radio frequency with existing radio telescope.