Surveying Instrument And Surveying Instrument System

A measuring instrument comprising:

• a distance measuring light projecting module for projecting a distance measuring light, a light receiving module for receiving a reflected distance measuring light, which is the distance measuring light retro-reflected by an object to be measured, and a reflected tracking light incident coaxially with the reflected distance measuring light, a distance measuring unit for receiving the reflected distance measuring light and performing a distance measurement, a tracking module for projecting a tracking light with the same optical axis as a distance measuring optical axis, for receiving the reflected tracking light separated from the reflected distance measuring light, for detecting a deviation between the reflected tracking light and said distance measuring optical axis, for calculating the tracking control information based on the deviation and for performing the tracking, an optical axis deflector for integrally deflecting the distance measuring light and the tracking light, and an arithmetic control module for controlling said optical axis deflector and for directing the distance measuring optical axis toward the object to be measured and performing a measurement, wherein said optical axis deflector has a pair of disk prisms in which two or more prism columns is arrayed in parallel, a rotary driving module for rotating said disk prisms individually, and a projecting direction detecting module for detecting a rotation angle of each of said disk prisms, wherein the tracking control information includes a detection result of said projecting direction detecting module, and said optical axis deflector is configured to be controlled based on the tracking control information.