Turbine vane adjustment device for a gas turbine

The guide vane adjusting device has multiple guide vanes (20) pivoting around a radial axis. The guide vanes are arranged in two radial planes. Two guide vane adjusting rings are coupled with the guide vanes and are rotatable in peripheral direction by an actuating device (30). The actuating device is coupled with the guide vane adjusting rings by a transmitting device (31). The transmitting device is arranged in another opposite transmitting device (32) which is coupled with the guide vane adjusting rings.