A traffic control device comprises a computer connected to a center-side communication device; the center-side communication device being a wireless communication device that is configured to conduct transmission and reception of wireless communication information with each of a first onboard communication terminal device mounted on a first manned working machine, which is configured to travel under operation by a first operator, and a second onboard communication terminal device which is configured to be mounted on an autonomous traveling working machine which autonomously travels according to a control command from the traffic control device, that is configured to receive, from the first onboard communication terminal device, information on a protected region setting request, which requests setting of a protected region for the first manned working machine to avoid interference with the autonomous traveling working machine, and information on a position of the first manned working machine, and that is configured to transmit the control command to the second onboard communication terminal device; the traffic control device being provided with: a traffic control map information storage section that is configured to store information on a map of a haul road on which the autonomous traveling working machine and the first manned working machine travel, and a protected region setting section that, when the center-side communication device receives the protected region setting request information, is configured to set, as a protected region for the first manned working machine, a region, in which the position of the first manned working machine is included and into which intrusion of the autonomous traveling working machine is prohibited, based on the map information and the position information received from the first onboard communication terminal device; the protected region including a first protected region, which includes the position of the first manned working machine, and a second protected region, which is set along a periphery of the first protected region; the first protected region being a region in which the first onboard communication terminal device does not transmit new protected region setting request information; the second protected region being a region in which the first onboard communication terminal device transmits new protected region setting request information; the protected region setting section being configured to output response information, which indicates positions of the first and second protected regions (101, 102) set responsive to the protected region setting request information, to the center-side communication device; and the response information being transmitted to the first onboard communication terminal device via the center-side communication device. a traffic control map information storage section that is configured to store information on a map of a haul road on which the autonomous traveling working machine and the first manned working machine travel, and a protected region setting section that, when the center-side communication device receives the protected region setting request information, is configured to set, as a protected region for the first manned working machine, a region, in which the position of the first manned working machine is included and into which intrusion of the autonomous traveling working machine is prohibited, based on the map information and the position information received from the first onboard communication terminal device; the protected region including a first protected region, which includes the position of the first manned working machine, and a second protected region, which is set along a periphery of the first protected region; the first protected region being a region in which the first onboard communication terminal device does not transmit new protected region setting request information; the second protected region being a region in which the first onboard communication terminal device transmits new protected region setting request information; the protected region setting section being configured to output response information, which indicates positions of the first and second protected regions (101, 102) set responsive to the protected region setting request information, to the center-side communication device; and the response information being transmitted to the first onboard communication terminal device via the center-side communication device.