A treatment device 20 comprises: a d power reception coil 29 having a solenoid shape that is inductively coupled with a power transmission coil 19 that generates an AC magnetic field, and receives electric power wirelessly； a treatment portion 21 that treats a subject with the electric power received by the power reception coil 29； a horn 22 inserted through an inside of the power reception coil 29； and a magnetic flux concentration member 27 that is made of a soft magnetic material and secured inside of the power reception coil 29.
