Provided is an optical tomographic device including a measurement optical system (24, 72, 48) that irradiates light from a light source (12) to inside a subject (100) and guides reflected light therefrom； a reference optical system (24, 22) that guides the light from the light source (12) as reference light； a calibration optical system (24, 72, 74) that irradiates at least one calibration reflecting surface (74a, 74b) with light from the light source (12) branched from the measurement or reference optical system, and guides the reflected light reflected by the calibration reflecting surface (74a, 74b)； a light-receiving element (26) that receives the interfering light for measurement formed by synthesizing the reflected light guided by the measurement optical system and the reference light, and the interfering light for calibration formed by synthesizing the reflected light guided by the calibration optical system and the reference light； and an arithmetic logic unit (64) that corrects the received interfering light for measurement by using an analysis result obtained by analyzing the received the interfering light for calibration.
