An optical image measuring apparatus, comprising: an optical system configured to split light from a light source into signal light and reference light, and detect 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; a scanner configured to carry out 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, and a second scan in which a second cross section that intersects the interested blood vessel and is located in the vicinity of the first cross section is scanned with the signal light; an image forming part configured to form 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 between signals corresponding to adjacent scanning points of the first cross section based on the detection results of the interference light acquired by the optical system during the first scan, and a second cross sectional image that expresses morphology of the second cross section based on the detection results of the interference light acquired by the optical system during the second scan; a blood vessel region specifying part configured to specify a blood vessel region corresponding to the interested blood vessel for each of the first cross sectional image and the phase image, and a blood vessel region corresponding to the interested blood vessel in the second cross sectional image; and a blood flow information generating part configured to generate blood flow information related to the interested blood vessel based on a distance between the first cross section and the second cross section, the blood vessel region of the first cross sectional image, the blood vessel region of the second cross sectional image, and the chronological variation of phase difference within the blood vessel region of the phase image; wherein the first cross sectional image is a series of cross sectional images in chronological order; and wherein the phase image is formed, for each pixel of the first cross sectional image, based on chronological variation of pixel value of the concerned pixel. an optical system configured to split light from a light source into signal light and reference light, and detect 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; a scanner configured to carry out 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, and a second scan in which a second cross section that intersects the interested blood vessel and is located in the vicinity of the first cross section is scanned with the signal light; an image forming part configured to form 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 between signals corresponding to adjacent scanning points of the first cross section based on the detection results of the interference light acquired by the optical system during the first scan, and a second cross sectional image that expresses morphology of the second cross section based on the detection results of the interference light acquired by the optical system during the second scan; a blood vessel region specifying part configured to specify a blood vessel region corresponding to the interested blood vessel for each of the first cross sectional image and the phase image, and a blood vessel region corresponding to the interested blood vessel in the second cross sectional image; and a blood flow information generating part configured to generate blood flow information related to the interested blood vessel based on a distance between the first cross section and the second cross section, the blood vessel region of the first cross sectional image, the blood vessel region of the second cross sectional image, and the chronological variation of phase difference within the blood vessel region of the phase image; wherein the first cross sectional image is a series of cross sectional images in chronological order; and wherein the phase image is formed, for each pixel of the first cross sectional image, based on chronological variation of pixel value of the concerned pixel.