DEVICE AND METHOD FOR MEASURING A DISTANCE

[Problem] Provided is a measurement device or the like that expands a dynamic range easily and promptly as appropriate even when three-dimensional data or the like on some parts of a measurement target object is not acquirable, so that the data can be acquired. [Solving means] A measurement device 1 includes a light source unit 8 that sequentially emits a plurality of beams of distance measurement light to an identical target object, based on predetermined fixed output information, a light reception unit 17 that receives reflected light, from the target object, based on which the measurement device acquires measurement information, and an output value reducing unit 45 and/or an input value reducing unit 45, the output value reducing unit 45 reducing an output value of the light source unit, the input value reducing unit 45 reducing an input value of the reflected light to the light reception unit.