Provided is an electronic apparatus in which an illuminance sensor is arranged on the back side of a display unit, and which can perform the appropriate luminance adjustment. The electronic apparatus includes a display unit, an illuminance sensor, a luminance control unit, and an operation judgement unit. The illuminance sensor is disposed on back side of the display surface of the display unit. The luminance control unit controls the luminance of the display unit based on the information related to light detected by the illuminance sensor. The operation judgement unit judges reliability of the information related to light detected by the illuminance sensor. The luminance control unit controls the luminance of the display unit when reliability is judged to be high. The luminance control unit suppresses control of the luminance of the display unit when reliability is judged to be low.