A three-dimensional measuring method comprising a total station having a tracking function and a movable measuring device having a prism for retro-reflecting a distance measuring light and a tracking light projected from said total station and designed as movable and capable of performing a three-dimensional measurement of an object to be measured, wherein said movable measuring device has an auxiliary measuring unit capable of measuring a distance and an angle of the object to be measured, wherein said total station is installed at a known point, said movable measuring device performs the three-dimensional measurement of the object to be measured with reference to a direction of said total station based on the measurement result of said auxiliary measuring unit at an arbitrary measurement position capable of being sighted from said total station, said total station measures said measurement position where said movable measuring device performs the three-dimensional measurement and the three-dimensional measurement result of said movable measuring device is coordinate-converted to a reference coordinate system with reference to said total station based on the measurement result of said measurement position measured by said total station and the three-dimensional measurement of the object tc be measured is performed with reference to said total station, characterised in that said movable measuring device has an attitude detector capable of detecting a measuring direction, a tilting and a tilting direction of said movable measuring device, said tracking light is a pulsed laser, said movable measuring device performs the three-dimensional measurement of the object to be measured based on a detection result of said attitude detector, said attitude detector has a timing pulse detecting unit, said timing pulse detecting unit receives said tracking light, produces a timing signal based on the detection result of said tracking light, and said moveable measuring device and said total station are synchronously controlled according to said timing signal. wherein said movable measuring device has an auxiliary measuring unit capable of measuring a distance and an angle of the object to be measured, wherein said total station is installed at a known point, said movable measuring device performs the three-dimensional measurement of the object to be measured with reference to a direction of said total station based on the measurement result of said auxiliary measuring unit at an arbitrary measurement position capable of being sighted from said total station, said total station measures said measurement position where said movable measuring device performs the three-dimensional measurement and the three-dimensional measurement result of said movable measuring device is coordinate-converted to a reference coordinate system with reference to said total station based on the measurement result of said measurement position measured by said total station and the three-dimensional measurement of the object tc be measured is performed with reference to said total station, characterised in that said movable measuring device has an attitude detector capable of detecting a measuring direction, a tilting and a tilting direction of said movable measuring device, said tracking light is a pulsed laser, said movable measuring device performs the three-dimensional measurement of the object to be measured based on a detection result of said attitude detector, said attitude detector has a timing pulse detecting unit, said timing pulse detecting unit receives said tracking light, produces a timing signal based on the detection result of said tracking light, and said moveable measuring device and said total station are synchronously controlled according to said timing signal.