A display device for projecting display light (L) emitted from a display unit onto a light transmitting member to display a virtual image (V) of an image formed by the display light (L), comprising: a stepping motor ; a reflector for reflecting the display light (L) emitted by the display unit toward the light transmitting member , the reflector moving in accordance with operation of the stepping motor ; a moving part moving together with the reflector ; drive means for driving the stepping motor with a microstep drive system; control means for controlling the drive means to control movement of the reflector; and a stopper unit (44/244/344) provided within a range of movement of the moving part ; and a gear mechanism including a plurality of gears such that rotational power of the stepping motor is transmitted to the reflector , characterized in that : the drive means has a function of detecting counter-electromotive power that is generated in the stepping motor when the moving part abuts against the stopper unit (44/244/344); when the drive means detects the counter-electromotive power, the control means is configured to determine a reference position for controlling movement of the reflector ; when the drive means detects the counter-electromotive power, the drive means is configured to supply, to the control means , a counter-electromotive signal indicating that the counter-electromotive power has been detected; the control means comprises a counter that counts the number of times at which a counter-electromotive signal is acquired from the drive means ; and the control means is configured to determine the reference position in the case where the counter-electromotive signal is acquired a predetermined number of times. a stepping motor ; a reflector for reflecting the display light (L) emitted by the display unit toward the light transmitting member , the reflector moving in accordance with operation of the stepping motor ; a moving part moving together with the reflector ; drive means for driving the stepping motor with a microstep drive system; control means for controlling the drive means to control movement of the reflector; and a stopper unit (44/244/344) provided within a range of movement of the moving part ; and a gear mechanism including a plurality of gears such that rotational power of the stepping motor is transmitted to the reflector , a moving part moving together with the reflector ; drive means for driving the stepping motor with a microstep drive system; control means for controlling the drive means to control movement of the reflector; and a stopper unit (44/244/344) provided within a range of movement of the moving part ; and a gear mechanism including a plurality of gears such that rotational power of the stepping motor is transmitted to the reflector , the drive means has a function of detecting counter-electromotive power that is generated in the stepping motor when the moving part abuts against the stopper unit (44/244/344); when the drive means detects the counter-electromotive power, the control means is configured to determine a reference position for controlling movement of the reflector ; when the drive means detects the counter-electromotive power, the drive means is configured to supply, to the control means , a counter-electromotive signal indicating that the counter-electromotive power has been detected; the control means comprises a counter that counts the number of times at which a counter-electromotive signal is acquired from the drive means ; and the control means is configured to determine the reference position in the case where the counter-electromotive signal is acquired a predetermined number of times. <EOS>