An antenna unit part is coupled to a housing unit in such a way that the antenna unit part can be relatively oscillated. Acceleration sensors that detect accelerations that occur in an azimuth angle direction and an elevation angle direction are provided in the housing unit. Linear actuators are provided between the housing unit and an antenna unit part so that the linear actuators are able to adjust a relative angle of the antenna unit part with respect to the housing unit. A variation amount calculation unit calculates a variation amount in the elevation angle direction and the azimuth angle direction based on the accelerations detected by the acceleration sensors. A correction amount calculation unit calculates a correction amount to cancel the variation amount calculated by the variation amount calculation unit. The linear actuators are driven based on the correction amount.