A fixing device comprising: a heating rotating member for heating a paper sheet to which toner is transferred; a pressing rotating member which is configured to be pressed to the heating rotating member so as to form a nip; a motor which is rotatable in forward and backward directions; a fixing pressure adjustment mechanism which is configured to be driven by the motor and to move a rotating member to be moved as one of the heating rotating member and the pressing rotating member in a pressure increasing direction and in a pressure decreasing direction between predetermined first and second positions, in accordance with a rotation direction of the motor, so as to adjust a fixing pressure as a pressure of the nip; a control section including a control device configured to issue an instruction of voltage to be applied to the motor by software control in accordance with the rotation direction of the motor; a motor drive section configured to control the voltage to be applied to the motor on the basis of the instruction from the control section; a detecting member configured to detect that the rotating member to be moved that has been moved by the fixing pressure adjustment mechanism reaches the first position so as to inhibit the output from being received by the control device; and a stop control circuit configured to receive an output of the detecting member and stops the motor without software control when the detecting member detects that the rotating member to be moved reaches the first position, wherein the fixing pressure adjustment mechanism includes a gear train for transmitting a driving force from the motor, the gear train includes a tooth-lacking gear arranged so that a gear for transmitting the driving force idles to stop the rotating member to be moved when the rotating member to be moved reaches the second position, the control section is configured to issue, when the control section moves the rotating member to be moved in a direction toward the second position, an instruction to the motor drive section to rotate the motor for a predetermined time necessary for moving in a direction corresponding to the moving direction of the rotating member to be moved toward the second position, and the time necessary for moving is longer than a time necessary for moving the rotating member to be moved from the first position to the second position. a heating rotating member for heating a paper sheet to which toner is transferred; a pressing rotating member which is configured to be pressed to the heating rotating member so as to form a nip; a motor which is rotatable in forward and backward directions; a fixing pressure adjustment mechanism which is configured to be driven by the motor and to move a rotating member to be moved as one of the heating rotating member and the pressing rotating member in a pressure increasing direction and in a pressure decreasing direction between predetermined first and second positions, in accordance with a rotation direction of the motor, so as to adjust a fixing pressure as a pressure of the nip; a control section including a control device configured to issue an instruction of voltage to be applied to the motor by software control in accordance with the rotation direction of the motor; a motor drive section configured to control the voltage to be applied to the motor on the basis of the instruction from the control section; a detecting member configured to detect that the rotating member to be moved that has been moved by the fixing pressure adjustment mechanism reaches the first position so as to inhibit the output from being received by the control device; and a stop control circuit configured to receive an output of the detecting member and stops the motor without software control when the detecting member detects that the rotating member to be moved reaches the first position, wherein the fixing pressure adjustment mechanism includes a gear train for transmitting a driving force from the motor, the gear train includes a tooth-lacking gear arranged so that a gear for transmitting the driving force idles to stop the rotating member to be moved when the rotating member to be moved reaches the second position, the control section is configured to issue, when the control section moves the rotating member to be moved in a direction toward the second position, an instruction to the motor drive section to rotate the motor for a predetermined time necessary for moving in a direction corresponding to the moving direction of the rotating member to be moved toward the second position, and the time necessary for moving is longer than a time necessary for moving the rotating member to be moved from the first position to the second position.