PURPOSE: To suppress the increase of temperature in a control panel within a use range of a unit by radiating heat generated in the control panel with high efficiency.

CONSTITUTION: A radiation device for a control panel comprises heat receiving containers 11 and 12 arranged to the peripheries of heat source parts A and B in a control panel 10, a liquid impregnating part arranged in the heat receiving containers 11 and 12, and a cooling part 15 arranged to the outside of the control panel 10. The heat radiation device is further provided with heat pipes 17-19, through which the heat receiving containers 11 and 12 are coupled to a cooling part 15 and which have end parts on one side being opened and coupled to the heat receiving containers 11 and 12 the end parts on the other side being closed and inserted in the cooling part 15, and a capillary tube part arranged on the inner whole peripheries of the heat pipes 17-19.