Apparatus for maintaining horizontal with open visual field

An apparatus for maintaining horizontal with an open visual field is a horizontal state maintaining apparatus for installation of a device. The apparatus for maintaining horizontal with an open visual field includes a first support mounted on the device, a second support which is rotatable through connection from the first support and an X-axis rotating wheel towards a first rotating shaft, a third support which is rotatably connected with the second support from a Y-axis rotating wheel towards a second rotating shaft and is rotatable connected with a combining body from a Z-axis rotating wheel towards a third rotating shaft, the apparatus is mounted in a direction opposite to the third rotating shaft with the first rotating shaft and the second rotating shaft being reference, and the first support forms the center of gravity among the first rotating shaft, the second rotating shaft and the third rotating shaft under the state of installation of the device. According to the apparatus provided by the invention