The invention provides an automatic leveling device comprising; one tilt sensor provided on a leveling base plate, a leveling mechanism unit capable of tilting the leveling base plate in at least two directions and a control device for controlling the leveling mechanism unit and for tilting the leveling base plate, wherein the control device is configured to tilt the leveling base plate so that the tilting of the leveling base plate follows a searching route as set in a process of a leveling from a condition where a tilt detecting signal from the tilt sensor is not obtained, carries out an auxiliary leveling to obtain signals from the tilt sensor in a process of changing the tilting, and carries out a main leveling by controlling the leveling mechanism unit based on the detection result from the tilt sensor where a tilt detecting signal is obtained from the auxiliary leveling.