To prevent abnormal rise of a surface temperature of a front upper portion of a face sheet (front panel), and to surely and quickly detect abnormal use states such that a towel and the like is hung at a front face of the face sheet (front panel), as a panel heater has a defect that the surface temperature of the front upper part of the face sheet (front panel) abnormally rises.

A heat shield panel opposite to an upper inner face of the front panel is internally disposed, an upper extended portion of a heat radiation panel is tilted in the direction of a back panel, and a second heating space is defined at an upper part of a heating space. A tilted top face is formed by tilting an upper part of the back panel in the direction of the front panel, a number of pores are formed on the tilted top face, and the second heating space is opened to the tilted top face. Further a high temperature detecting device is disposed in the second heating space.