A liquid level detecting device comprises: a plurality of sensors (10) that are installed, so that the position heights are mutually different, on the surface of a container (9), in which the level of liquid is to be detected, and that measure the temperature of the installed locations by means of a temperature measuring element (103); and a liquid level detecting unit (204) that specifies, as the position of the sensor with the lowest measured value of the plurality of sensors (10), the liquid level position in the container (9) that has a temperature difference between the interior and exterior such that the interior temperature of the container (9) is lower than the exterior temperature and that is in a state where a fluid flows into and out of the container (9).
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