To provide a space information display device capable of acquiring space information (three-dimensional information) and displaying the acquired information so that a user, an operator, etc. can easily use the information, while the display device is configured relatively simply and at low cost.

The display device: acquires space information (three-dimensional information) in association with image information by imaging a work space by a stereo camera 10 installed on a working machine 1, displays the image information on the screen of a display device 20, and displays space information corresponding to a directed point on the display device 20 when a user directs a screen on which the image information is displayed.