<p>A receiving device (10) receives a desired transmission signal as a receiving signal, a resonance frequency of a receiving antenna (11) is adjustable, and the resonance frequency of the receiving antenna (11) is adjusted by a direct current control voltage outputted from a direct current control voltage generating section (16c). As a result, a receiving electric field status discriminating section (16b) controls the direct current control voltage generating section in accordance to a receiving electric field level of the receiving signal received by the receiving antenna.</p>
