HEAT STORAGE DEVICE, AND SYSTEM PROVIDED WITH HEAT STORAGE DEVICE

Provided is a heat storage device which can stably store heat by storing heat within a fixed temperature range. A heat storage device (10) of the present invention is characterized in being provided with a heat resistant frame (11), which is filled with one kind of alloy or mixed salt having a predetermined eutectic temperature, alternatively, a heat resistant frame (11), which is filled with two or more kinds of alloys or mixed salts having different eutectic temperatures, by having the alloys or the mixed salts adjacent to each other in the order of eutectic temperature levels with a partitioning wall (11a) therebetween. The heat storage device is also characterized in that the heat resistant frame (11) filled with the one kind of alloy or mixed salt having the predetermined eutectic temperature is set as a heat absorption-side heat storing section (12) and a heat dissipation-side heat storing section (13), alternatively, in the case where there are two or more kinds of alloys or mixed salts, the heat resistant frame (11) filled with an alloy (1) or a mixed salt (1) having a highest eutectic temperature is set as the heat absorption-side heat storing section (12), and that a heat resistant frame (11), which is filled with an alloy (2) or a mixed salt (2) having a lowest eutectic temperature is set as the heat dissipation-side heat storing section (13).