A measurement device includes: a light source that generates a pump beam and a Stokes beam a pulse stretch section that stretches the pulse of the pump beam so that the pulse width of the Stokes beam is shorter than the pulse width of the pump beam an optical splitter that splits the Stokes beam into two beams an optical scan section that scans a subject with the pulse-stretched pump beam and one of the two beams split by the optical splitter a first optical detector that detects an anti-Stokes beam from the subject a second optical detector that detects an interference beam of the other of the two beams and the Stokes beam reflected by the subject and a signal processing section that performs an image generation process based on a detection signal from the first optical detector and a detection signal from the second optical detector.
