To provide a heating device for efficiently and uniformly heating a room in which strong cold draft occurs, while securing the interior quality of the room in which the heating device is arranged.

A window heating device 100 comprises a heating element installation part 101 provided between a first window and a second window arranged up and down, on the outdoor side of an inner wall face, a heating element 110 provided in the heating element installation part 101, a hiding means 190 provided on the front face of the heating element installation part 101, an air outlet 120 provided in the upper part of the heating element installation part 101, and an air inlet 121 provided in the heating element installation part 101.