To provide a mobile type warm chamber of simple configuration which has lesser temp. drop even though a door is opened and shut at the time of movement after the power is shut off.

A mobile type warm chamber 100 includes an electric heat source 103 to heat the inside of a heat insulation box 101 and another electric heat source 12 of a heat accumulator 10, and these heat sources are put in the heat emitting operation with the power supplied from a power plug 110. The heat source 103 heats directly the inside of the box 101 at approx. 80°C while the heat source 12 heats a heat accumulating material 11 at approx 300°C. Because this warm chamber 100 travels in the condition that the plug 110 is drawn out of the power outlet so that the power is shut off, the temp. drops by opening and closing of the door. The oversurface 11a of the heat accumulating material 11 is enclosed with a heat insulation barrier 13 having a low heat insulation property while the other surface is covered with a heat insulation borrier 14 having a high heat insulation property. Because the calorific quantity of the material 11 is released through the heat insulation barrier 13 and the drop of the temp. is complemented, it is possible to make warm keeping for a long period of time. It is also possible that the heat insulation barrier 13 is moved interlockingly with the opening and closing of the door and the oversurface 11a of the material 11 is left open.