The invention is to provide a knee sauna device, in which delays or minimizes heat loss by adjusting according to a lower body condition of user and making it contact tightly to thighs, enabling to enjoy a dry-type sauna, which includes a case (10) having a opening portion (11), a raising board (20) installed in the opening portion (11) of the case (10) so as to be raised or lowered, a stopper (30) installed between the case (10) and the raising board (20) and fixing the raising board (20), a first heater (40) installed on an internal bottom surface of the case (10), and a second heater (50) installed on an internal top surface of the case (10) protrudingly toward the opening portion (11). The raising board enables a user to adjust and use according to lower body condition (knee height and thigh thickness).
