Three-dimensional input device and input system

PROBLEM TO BE SOLVED: To provide a three-dimensional input device and input system that are operable with no limit to a service space and a use state.SOLUTION: A three-dimensional input device comprising: two optical measurement means 12a and 12b disposed at a predetermined interval; a three-dimensional position detector 1 that measures the three-dimensional position of a measuring object based on the direction and the predetermined interval of the measuring object separately obtained by the two optical measurement means on a real-time basis and is mountable to a human body; and a controller 13, characterized in that the controller generates input information based on variation in the three-dimensional position and how the measuring object is varied.SELECTED DRAWING: Figure 1