A treatment device comprises: a power reception coil having a solenoid shape that is inductively coupled with a power transmission coil that generates an AC magnetic field, and receives an electric power wirelessly； a treatment portion that treats a subject with the electric power received by the power reception coil； a horn inserted through an inside of the power reception coil； and a magnetic flux concentration member that is made of a soft magnetic material and secured inside of the power reception coil.
