To warm beverage at a prescribed temperature without being influenced by the contact state of a storing container and a warming plate.
A warming temperature detection means 10 is provided at the warming plate 5 to detect difference between the upper and lower peak temperatures of a temperature waveform at the warming plate 5 in the case of carrying out heating control for keeping the temperature of the warming plate 5 to be constant to grasp the state of transmitting heat from to the storing container 7 for estimating the temperature of a liquid 6 inside the storing container 7. On the basis of the temperature difference between the peaks, a control means 11 controls the device to change the temperature setting of the warming plate 5 to change the temperature of the liquid 6 inside the storing container 7 to an optional set value.
Tomoyasu Sakaguchi
Hiroki Naito
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