A measurement device includes: a light source section (10) that generates a pump beam (P) and a Stokes beam (S) a pulse stretch section (30) that stretches the pulse of the pump beam (P) so that the pulse width of the Stokes beam (S) is shorter than the pulse width of the pump beam (P) an optical splitter section (41) that splits the Stokes beam (S) into two beams an optical scan section (50) that scans a subject (S) with the pulse-stretched pump beam (P) and one (SM) of the two beams split by the optical splitter section (41) a first optical detection section (70) that detects an anti-Stokes beam (AS) from the subject (S) a second optical detection section (80) that detects an interference beam of the other (SS) of the two beams and the Stokes beam (SM) reflected by the subject (S) and a signal processing section (90) that performs an image generation process based on a detection signal from the first optical detection section (70) and a detection signal from the second optical detection section (80).
