A thermatological device comprising an applicator and a main body. The applicator has a microwave-applying section, a first temperature sensor and a second temperature sensor. The main body contains a control unit. The microwave-applying section applies microwaves to an affected part, thereby treating the part. The first temperature sensor detects the temperature of the affected part being treated. The, the second temperature sensor detects a part located adjacent to the affected part. The control unit controls the microwave-applying section to render the temperature detected by the first temperature sensor equal to a preset target temperature. The control unit causes the microwave-applying section to stop or reduce the emission of microwaves when the temperature detected by the second temperature sensor reaches a preset burn temperature.