A traffic control server for performing traffic control of a first vehicle, which is traveling in an approach lane in a mine where the approach lane and a return lane are provided in parallel to each other, and a second vehicle, which is different in attribute from the first vehicle and is traveling in the return lane, characterized in that the traffic control server comprises a travel-permitted zone setting unit configured to perform setting and cancelling of a first travel-permitted zone as a partial zone, where the first vehicle is allowed to travel, in the approach lane, a travel permission restricted zone associated with the first travel-permitted zone in the return lane where the second vehicle is restricted to travel, and a second travel-permitted zone as another partial zone, where the second vehicle is allowed to travel, in the return lane, and the travel-permitted zone setting unit is configured to: when setting the first travel-permitted zone, perform setting of a further partial zone, which is parallel to the first travel-permitted zone, in the return lane as the travel permission restricted zone, when setting a new first travel-permitted zone in the approach lane in association with traveling of the first vehicle, perform setting of a new travel permission restricted zone associated with the new first travel-permitted zone in the return lane, as well as, in case that a distance in the approach lane from a current position of the first vehicle to a forward end of the first travel-permitted zone through which the first vehicle has already passed is at least equal to a predetermined travel permission cancelling distance, perform cancelling of the first travel-permitted zone through which the first vehicle has already passed, when having set the travel permission restricted zone associated with the first travel-permitted zone in the return lane through which the first vehicle has already passed, perform cancelling of the travel permission restricted zone associated with the first travel-permitted zone in the return lane through which the first vehicle has already passed, and when receiving a request for setting of a new second travel-permitted zone from the second vehicle and in case that the travel permission restricted zone has been set to a zone in the return lane to which is requested to be set the new second travel-permitted zone by the second vehicle, restrict the setting of the new second travel-permitted zone to the zone in the return lane, and in case that the travel permission restricted zone, which has been set to the zone in the return lane, is cancelled, perform the setting of the new second travel-permitted zone to the zone in the return lane, which has been restricted to be set the new second travel-permitted zone. when setting the first travel-permitted zone, perform setting of a further partial zone, which is parallel to the first travel-permitted zone, in the return lane as the travel permission restricted zone, when setting a new first travel-permitted zone in the approach lane in association with traveling of the first vehicle, perform setting of a new travel permission restricted zone associated with the new first travel-permitted zone in the return lane, as well as, in case that a distance in the approach lane from a current position of the first vehicle to a forward end of the first travel-permitted zone through which the first vehicle has already passed is at least equal to a predetermined travel permission cancelling distance, perform cancelling of the first travel-permitted zone through which the first vehicle has already passed, when having set the travel permission restricted zone associated with the first travel-permitted zone in the return lane through which the first vehicle has already passed, perform cancelling of the travel permission restricted zone associated with the first travel-permitted zone in the return lane through which the first vehicle has already passed, and when receiving a request for setting of a new second travel-permitted zone from the second vehicle and in case that the travel permission restricted zone has been set to a zone in the return lane to which is requested to be set the new second travel-permitted zone by the second vehicle, restrict the setting of the new second travel-permitted zone to the zone in the return lane, and in case that the travel permission restricted zone, which has been set to the zone in the return lane, is cancelled, perform the setting of the new second travel-permitted zone to the zone in the return lane, which has been restricted to be set the new second travel-permitted zone.