NOVELTY - A heat insulating container (10) comprises a heat source (reaction device body) (31); a housing (34) that houses the heat source in it; and a temperature detection unit (35) that is formed on a surface of the housing and reflects radiation. The temperature detection unit comprises a resistor layer; an adhesion layer that is interposed between the resistor layer and surface of housing, and that improves adhesion property between them; and a diffusion prevention layer that is interposed between the adhesion layer and resistor layer, and that suppresses thermal diffusion between them.    USE - As heat insulating container (reaction device) in a power generation apparatus useful in an electronic equipment (claimed) such as notebook personal computer, a cellular phone, a personal digital assistant (PDA), an electronic organizer, a wrist watch, a digital still camera, a digital video camera, a game instrument, a gaming machine, and other electronic equipments, as a power supply to operate these electronic equipments.    ADVANTAGE - The heat insulating container has a temperature detection unit formed on a surface of the housing. Thus, it is possible to monitor whether or not the temperature of the heat insulating package is high, by measuring the temperature of the heat insulating package itself. There is a convenience that the monitoring circuit can be used for both monitoring the temperatures of the thin-film heaters, and monitoring the temperature of the temperature detection unit (thin-film temperature sensor), achieving an advantage in using the reaction device for a small instrument. The thin-film temperature sensor functions as a reflection film by the resistor layer. Accordingly, the heat rays/electromagnetic waves emitted from the reaction device body (heat source) and the thin-film heaters are reflected by the thin-film temperature sensor. Therefore, the heat loss caused by the radiation can be suppressed. Moreover, a radiation reflection film which is separate from the thin-film temperature sensor is not provided, and therefore, manufacturing cost of the reaction device can be suppressed.    DETAILED DESCRIPTION - A heat insulating container (10) comprises a heat source (reaction device body) (31); a housing (34) that houses the heat source in it; and a temperature detection unit (35) that is formed on a surface of the housing and reflects radiation. The temperature detection unit comprises a first resistor layer, of which electrical resistance changes by temperature; a first adhesion layer that is interposed between the first resistor layer and the surface of the housing, and that improves adhesion property between the first resistor layer and the housing; and a first diffusion prevention layer that is interposed between the first adhesion layer and the first resistor layer, and that suppresses thermal diffusion between the first adhesion layer and the first resistor layer which is caused by heat. The heat insulating container further comprises a heating unit (32, 33) that heats the heat source. The heating unit comprises a second resistor layer, of which electrical resistance changes by temperature; a second adhesion layer that is interposed between the second resistor layer and the heat source, the second adhesion layer improving adhesion property between the second resistor layer and the heat source; and a second diffusion prevention layer that is interposed between the second adhesion layer and the second resistor layer, the second diffusion prevention layer suppressing thermal diffusion between the second adhesion layer and the second resistor layer which is caused by heat.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective view of reaction device.    Heat insulating container (10)    Heat source (31)    Heaters (32, 33)    Housing (34)    Temperature detection unit. (35)