A friction drive trolley conveyor has a conveying traveling body provided with a friction drive load bar having traction purpose engaging means at both ends thereof and allows traction drive to be easily conducted without fail even at the time of conveying a heavy object. The traction purpose engaging means is composed of an engaged shaft arranged in the horizontal direction within a vertical notched portion formed at one end of the load bar, a hook member vertically swingably pivotally supported at an intermediate position in vertical height of the load bar at the other end of the load bar and a holding means holding the hook member in an engaged posture or a disengaged posture, and on a traveling route side, a first switching means switching the hook member from the engaged posture to the disengaged posture and a second switching means switching the hook member from the disengaged posture to the engaged posture.