PURPOSE: To elevate the reliability while simplifying the construction of a gas rate gyroscope by having a working gas ionized and flying with an electric field to generate a gas flow in a purely electric manner.

CONSTITUTION: An a gas is fed from an inflow port 12 into a closed container 2 of a gas rate gyroscope body 1 causing it to exhaust until the average free travel of ion becomes larger than the distance between an ion acceleration electrode 7 and a collector electrode 10 therein 2, the gas is ionized by discharge, accelerated with the electrode 7 to be focused like a beam with a convergence electrode 8 and released to a detection area 3. Then, the gas flies to the collector electrode 10 to reach a detection electrode 11 eccentrically from the center line according to an angular velocity applied on the free axis vertical to the center axis of the container 2 and a gyroscope output proportional to the eccentricity thereof is detected. With such an arrangement of generating the gas flow in a purely electric manner, mechanically mobile parts are eliminated thereby simplifying the construction of the gas rate gyroscope while elevating the reliability.