The position of an imaging means relative to a measurement stage is moved based on a stage movement instruction input. The amount of light illuminating a work is adjusted by flashing strobe illumination at a certain cycle repeatedly and adjusting the pulse width of the strobe illumination based on an illumination adjustment instruction input. A part program is generated for image measurement including fetching positional information about the imaging means relative to the measurement stage and information about the pulse width of the strobe illumination based on a certain instruction input, irradiating the measuring object with strobe illumination of the pulse width passing through the position indicated by the fetched positional information and fetched at that position, and capturing instantaneous image information about the work.