A lens drive device capable of operating either of a first interchangeable lens barrel having a photographic lens movable relative to the barrel in a prescribed range with switches arranged at the terminal ends of the range so that when movement of the photographic lens reaches the terminal end, a motor driving the focusing lens member is stopped, and a second interchangeable lens barrel having no switches for stopping the focusing lens drive motor, wherein when the first barrel is in use, the lens drive signal is stopped based on the aforesaid switch, and when the second barrel is in use, the aforesaid signal is stopped in a prescribed time measured from the start of rotation of the motor.