A steering device comprising: an operating member that steers a vehicle; a first moving unit that moves in an axial direction of a shaft member having the operating member connected at a rear end, along with the shaft member, and rotatably supports the shaft member; a second moving unit that holds the first moving unit so as to be movable in the axial direction; a holding unit that holds the second moving unit so as to be movable in the axial direction; a first screw mechanism that is disposed between the first moving unit and the second moving unit and moves the first moving unit in the axial direction; a second screw mechanism that is disposed between the second moving unit and the holding unit and moves the second moving unit in the axial direction; a driving unit that outputs driving force for driving the first screw mechanism and the second screw mechanism; and a transmission mechanism that is coupled to the first screw mechanism, the second screw mechanism, and the driving unit and transmits driving force of the driving unit to the first screw mechanism and the second screw mechanism, wherein: the steering device moves the operating member between an operation region and a retraction region; and one of the first screw mechanism and the second screw mechanism is provided so as to operate in a forward direction when the operating member moves between the retraction region and the operation region, characterized in that reverse efficiency of that one screw mechanism is set such that when the operating member is subjected to an external force directed toward the retraction region, that one screw mechanism does not operate in a reverse direction due to the external force, wherein when the operating member is subjected to the external force directed toward the retraction region, that one screw mechanism functions as a lock mechanism and the other screw mechanism does not function as a lock mechanism. an operating member that steers a vehicle; a first moving unit that moves in an axial direction of a shaft member having the operating member connected at a rear end, along with the shaft member, and rotatably supports the shaft member; a second moving unit that holds the first moving unit so as to be movable in the axial direction; a holding unit that holds the second moving unit so as to be movable in the axial direction; a first screw mechanism that is disposed between the first moving unit and the second moving unit and moves the first moving unit in the axial direction; a second screw mechanism that is disposed between the second moving unit and the holding unit and moves the second moving unit in the axial direction; a driving unit that outputs driving force for driving the first screw mechanism and the second screw mechanism; and a transmission mechanism that is coupled to the first screw mechanism, the second screw mechanism, and the driving unit and transmits driving force of the driving unit to the first screw mechanism and the second screw mechanism, wherein: the steering device moves the operating member between an operation region and a retraction region; and one of the first screw mechanism and the second screw mechanism is provided so as to operate in a forward direction when the operating member moves between the retraction region and the operation region, characterized in that reverse efficiency of that one screw mechanism is set such that when the operating member is subjected to an external force directed toward the retraction region, that one screw mechanism does not operate in a reverse direction due to the external force, wherein when the operating member is subjected to the external force directed toward the retraction region, that one screw mechanism functions as a lock mechanism and the other screw mechanism does not function as a lock mechanism. the steering device moves the operating member between an operation region and a retraction region; and one of the first screw mechanism and the second screw mechanism is provided so as to operate in a forward direction when the operating member moves between the retraction region and the operation region, characterized in that reverse efficiency of that one screw mechanism is set such that when the operating member is subjected to an external force directed toward the retraction region, that one screw mechanism does not operate in a reverse direction due to the external force, wherein when the operating member is subjected to the external force directed toward the retraction region, that one screw mechanism functions as a lock mechanism and the other screw mechanism does not function as a lock mechanism.