An energy treatment instrument includes a held unit capable of being held, and an electric-receiver-side resonator including an electric receiver coil wound around a coil axis, and resonating at the same resonance frequency as an electric-supplier-side resonator, thereby electric power being supplied from an electric supplier coil to the electric receiver coil. The energy treatment instrument includes an energy generator generating energy for use in a treatment by using the electric power supplied to the electric receiver coil, and a magnetic member including a magnetic material and located distant from the coil axis of the electric receiver coil.
