The present invention relates to a radiofrequency (RF) hyperthermia device comprising a radiofrequency carrier signal generator (1), a radiofrequency amplifier (4), an electrode (6) and a counter-electrode (7), a first impedance measuring means (2), a first impedance matching means (3), a second impedance measuring means (5), and at least one second impedance matching means (8 or 8'), wherein the at least one second impedance matching means is configured and adapted to match the second impedance measured by the second impedance measuring means to the predetermined value. This radiofrequency (RF) hyperthermia device is designed for the hyperthermia treatment by optimized double impedance matching system.
