To provide a lens device which is made silent and easy to wire wiring along a position sensor.

The lens device includes: fixed members 1 and 5; a moving barrel 7 which moves in an optical axis direction between a storage position where the moving barrel is stored with respect to the fixed members and a projection position where the moving barrel is more projected than in the storage position with respect to the fixing members; a cam barrel 6 which is rotated around an optical axis with respect to the fixed members and moves the moving barrel between the storage position and the projection position; a first actuator 2 which rotates the cam barrel through a speed reduction gear train; movable lenses 8 and 17 which are arranged in the moving barrel and movable in the optical axis direction with respect to the moving barrel; a second actuator 25 which is held in the moving barrel and moves the movable lenses in the optical axis direction with respect to the moving barrel; and the position sensor 32 which is attached to the fixed members and detects that the movable lenses are moved to a reference position being the position detection reference in the optical axis direction of the movable lenses.