To provide an indicator for indicating current amounts and predicted amounts of cold energy and heat energy stored in a thermal storing device.The thermal storage device storing and outputting heat energy and cold energy, comprises: a thermal storage amount indicating means for detecting and indicating a storage amount of the heat energy or the cold energy; a thermal output amount indicating means for detecting and indicating an output amount of the heat energy or the cold energy and a thermal input amount indicating means for detecting and indicating an amount of the heat energy or the cold energy inputted from outside to be stored.