A surveying instrument comprising: a distance measuring light projector configured to project a distance measuring light to an object, a distance measuring light receiver having a photodetector configured to receive a reflected distance measuring light from said object, a tracking light projector configured to project a tracking light to said object, and a tracking light receiver having a tracking photodetector configured to receive a reflected tracking light from said object, wherein said distance measuring light projector and said tracking light projector include a first deflecting optical member configured to deflect any one of said distance measuring light and said tracking light in such a manner that said distance measuring light and said tracking light become coaxial with each other, and a second deflecting optical member configured to reflect said distance measuring light and said tracking light and transmit through said reflected distance measuring light and said reflected tracking light, said distance measuring light receiver and said tracking light receiver have a receiving prism (44, 76, 84, 89) provided on a common optical path of said reflected distance measuring light and said reflected tracking light which have been transmitted through said second deflecting optical member, and said receiving prism is configured to internally reflect said reflected distance measuring light and said reflected tracking light more than once, then separate said reflected distance measuring light from said reflected tracking light, cause said reflected distance measuring light to be received by said photodetector, and cause said reflected tracking light to be received by said tracking photodetector, wherein said receiving prism (44, 76, 84, 89) includes a first prism configured to internally reflect said reflected distance measuring light and said reflected tracking light and a second prism (64, 75, 83, 88) configured to internally reflect said reflected tracking light, a boundary surface between said first prism and said second prism is a surface facing a surface of said first prism from which said reflected distance measuring light is projected, and said boundary surface is a separating surface of said reflected distance measuring light and said reflected tracking light, wherein a dichroic filter film is provided on said separating surface, and is configured to reflect said reflected distance measuring light and transmit through said reflected tracking light. wherein said receiving prism (44, 76, 84, 89) includes a first prism configured to internally reflect said reflected distance measuring light and said reflected tracking light and a second prism (64, 75, 83, 88) configured to internally reflect said reflected tracking light, a boundary surface between said first prism and said second prism is a surface facing a surface of said first prism from which said reflected distance measuring light is projected, and said boundary surface is a separating surface of said reflected distance measuring light and said reflected tracking light, wherein a dichroic filter film is provided on said separating surface, and is configured to reflect said reflected distance measuring light and transmit through said reflected tracking light.