Patent ID: 8406949

Claim:
A travel control device for an unmanned conveyance vehicle, comprising: a first magnetic sensor that is arranged in an unmanned conveyance vehicle to detect a guide tape laid down along a road travel surface; a plurality of second magnetic sensors that are arranged on left and right sides of the first magnetic sensor to detect magnetic markers laid down along the road travel surface on the sides of the guide tape; a magnetic member that is arranged above the first and second magnetic sensors to improve detection sensitivities of the magnetic sensors; and a control unit that performs guided travel and various operation controls of the unmanned conveyance vehicle on the basis of detection signals from the first and second magnetic sensors, wherein the control unit includes erroneous determination preventing means, wherein, when a plurality of detection signals output from the second magnetic sensors include only one ON signal, the erroneous determination preventing means determines the ON signal to be valid, and when the detection signals include a plurality of ON signals, the erroneous determination preventing means determines all the ON signals to be invalid.