A rotating device 9 is for rotating a vertically long drivable element 90 about specified two axes (rotation axis A, rotation axis B) and is provided with a first and a second actuators 91A, 91B for giving torques to the drivable element 90, a pivot bearing portion 92 as a rotation supporting point of the drivable element 90, a first and a second position detecting sensors 93A, 93B for detecting the rotational posture of the drivable element 90, and a posture controller 94. Detecting portions 905A, 905B of the first and second position detecting sensors 93A, 93B are arranged on a straight line L1 connecting acting portions 904A, 904B of the first and second actuators 91A, 91B and near the acting portions 904A, 904B. The position of the drivable element can be detected by a simple construction and the drivable element can be quickly returned to an original position.