A fundus photographing apparatus is provided with: a detector that detects an interference state between light reflected from the fundus and reference light; an optical scanner that scans the fundus of an examinee's eye with the measurement light; a focus detection unit that detects a focus position with respect to the fundus of the examinee's eye based on an output signal from a light receiving element that receives the light reflected from the fundus; a focus adjustment unit that corrects the diopter scale with respect to the examinee fundus by moving a first optical member to the focus position; a second optical member disposed in the optical path of the measurement light or the reference light; and an optical path length adjustment unit that adjusts an optical path length difference between the measurement light and the reference light.