Blood flow measurement can be carried out with high accuracy. An optical image measuring apparatus of embodiment include an optical system, scanner, image forming part, blood vessel region specifying part and blood flow information generating part. The optical system splits light from a light source into signal light and reference light and detects interference light between scattered light of the signal light from a living body and the reference light having traveled by way of a reference optical path. The scanner performs a first scan in which a first cross section that intersects an interested blood vessel in the living body is repeatedly scanned with the signal light. The image forming part forms a first cross sectional image that expresses chronological variation of morphology of the first cross section and a phase image that expresses chronological variation of phase difference based on the detection results of the interference light acquired by the optical system during the first scan. The blood vessel region specifying part specifies a blood vessel region corresponding to the interested blood vessel for each of the first cross sectional image and the phase image. The blood flow information generating part generates blood flow information related to the interested blood vessel based on the blood vessel region of the first cross sectional image and the chronological variation of phase difference within the blood vessel region of the phase image.
