A contactless power transfer apparatus includes an E-class amplifier having a coil configured to store an amount of energy for use in contactless power transfer and a field-effect transistor for controlling a current that flows in the coil, and an arrester provided between a drain terminal and a source terminal of the field-effect transistor and configured to be operated in response to application of a voltage having a voltage value lower than an absolute maximum rated voltage value between the drain and the source of the field-effect transistor.