The invention provides a contactless receiver with a receiving part and a rectification part, a resonant circuit used for the contactless receiver, and a variable capacitance element. The receiving part is provided with a resonance circuit which comprises a resonant circuit of by a variable capacitance element prepared by ferroelectric materials, and a resonance coil connected to a resonance capacitor, a capacitance of the variable capacitance element changing according to a received voltage at a predetermined frequency. The rectification part converts an alternating current voltage output from the receiving part into a direct current voltage. The invention provides a simpler structure and higher voltage resistance to received voltage.