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.
