An optical image measurement device that has: an interference-light generator configured to split light from a broadband light source, which is adapted to output low-coherence light, into a signal light and a reference light and superimpose the signal light propagated through a measurement object and the reference light propagated through a reference object to generate an interference light; a detector configured to detect the generated interference light; an imaging device (10, 12) and imaging light source (101, 103) adapted to provide a 2-dimensional image; a scanning unit adapted to scan the signal light; and an image forming part configured to form a 3-dimensional, scanned image of the measurement object based on a detection result from the detector, and adapted to provide said 2-dimensional image, the optical image measurement device comprising: a designating part configured to designate a region of interest in said 2-dimensional image of the measurement object; a scanner configured to scan the measurement object with the signal light; and a controller configured to control the scanner to scan with the signal light at a first scan interval in a partial region of the measurement object including an attention site corresponding to the region of interest in the image of the measurement object, and at a second scan interval larger than the first scan interval in a region other than the partial region, in execution of a series of scans with the signal light, wherein the scan interval is an interval between scanned points on one scanning line, or an interval between a scan line and the next scan line. an interference-light generator configured to split light from a broadband light source, which is adapted to output low-coherence light, into a signal light and a reference light and superimpose the signal light propagated through a measurement object and the reference light propagated through a reference object to generate an interference light; a detector configured to detect the generated interference light; an imaging device (10, 12) and imaging light source (101, 103) adapted to provide a 2-dimensional image; a scanning unit adapted to scan the signal light; and an image forming part configured to form a 3-dimensional, scanned image of the measurement object based on a detection result from the detector, and adapted to provide said 2-dimensional image, the optical image measurement device comprising: a designating part configured to designate a region of interest in said 2-dimensional image of the measurement object; a scanner configured to scan the measurement object with the signal light; and a controller configured to control the scanner to scan with the signal light at a first scan interval in a partial region of the measurement object including an attention site corresponding to the region of interest in the image of the measurement object, and at a second scan interval larger than the first scan interval in a region other than the partial region, in execution of a series of scans with the signal light, wherein a designating part configured to designate a region of interest in said 2-dimensional image of the measurement object; a scanner configured to scan the measurement object with the signal light; and a controller configured to control the scanner to scan with the signal light at a first scan interval in a partial region of the measurement object including an attention site corresponding to the region of interest in the image of the measurement object, and at a second scan interval larger than the first scan interval in a region other than the partial region, in execution of a series of scans with the signal light, wherein the scan interval is an interval between scanned points on one scanning line, or an interval between a scan line and the next scan line.