PASSENGER BOARDING BRIDGE

A passenger boarding bridge is capable of avoiding docking by backward travel of travel wheels. The passenger boarding bridge includes: a rotunda connected to an entrance of a terminal building and supported to be rotatable horizontally; an extendable and retractable tunnel unit whose proximal end is connected to the rotunda; a cab provided at a distal end of the tunnel unit; travel wheels configured to travel forward and backward in changeable directions; an operating device that is operated to input an operation command to the travel wheels; and a determiner configured to, during a period from when the cab starts being moved from a predetermined position, until the cab is docked with an aircraft, while the travel wheels are traveling backward, perform determination whether or not there is a possibility that the cab will come closer to the aircraft to get docked with the aircraft.