Abstract: A gas-rate sensor is disclosed which comprises, similar to a conventional one, a hollow cylindrical casing with a gas sealed therein, a gas pump arranged within the casing at its one end to circulate the gas therein, a nozzle means arranged within the casing at its other end to inject the gas as a gas flow therein, and a pair of thermosensitive elements disposed inside the casing so as to be exposed to the gas flow, whereby when the casing is applied an angular velocity the gas flow is deflected to cool the two thermosensitive elements unequally causing a difference in electric resistance between them, the measurement of the difference in resistance making it possible to detect the angular velocity, and which is characterized in that a heater plate is disposed within the casing so as to directly heat the gas circulated therein in order to compensate for the influence of the outside temperature on the accuracy of the measurement of the angular velocity instead of heating the casing from its outer periphery by