Patent ID: 7092104

Claim:
A speckle interferometer apparatus for dividing a luminous flux from a light source into two luminous fluxes, irradiating a rough object surface acting as a surface to be measured with the two luminous fluxes, causing respective reflected luminous fluxes of the two luminous fluxes from the rough object surface to interfere with each other, and capturing an image of an interference speckle pattern formed by the interference; the apparatus comprising: a luminous flux dividing device which divides the luminous flux from the light source into the two luminous fluxes; two luminous flux outputting devices which outputs the respective divided luminous fluxes toward the rough object surface; and an optical member mounting, which mounts the luminous flux dividing device and luminous flux outputting devices is disposed on the rough object surface side of a main unit of an imaging device which captures the image of the interference speckle pattern while being separated from the imaging device, wherein a predetermined area of the optical member mounting located between the two luminous flux outputting devices is a light-transmitting area which transmits therethrough interference light from the rough object surface.