A wireless communication system including an on-board terminal equipment mounted on a working machine, which travels along a predetermined travel route in a mine, and a control server, which manages operation of the working machine, communicably connected together via a network including a first wireless base station and a second wireless base station, characterized in that: the control server comprising a travel-permitted region setting unit receiving a permission request information for the working machine; said control server, responsive to the permission request information setting a region in the travel route, for which a travel permission has been given only to the working machine, as a travel-permitted region and generating permission response information including position information of the travel-permitted region; said control server further comprising: a no-handover zone setting unit setting a travel permission requesting zone out of the travel-permitted region as a no-handover zone, in which zone, the working machine makes a setting request to the control server for setting a new travel-permitted region as a no-handover zone in which switching of a connected base station from the first wireless base station to the second wireless base station is prohibited, a switching operation control unit generating switching operation control information for allowing the working machine to perform switching of the connected base station outside the no-handover zone, and a server-side communication control unit transmitting the switching operation control information to the working machine; and the on-board terminal equipment comprising: a terminal-side communication control unit receiving the switching operation control information, and based on the switching operation control information, switching the connected wireless base station (41-1, 41-2) in a zone other than the no-handover zone, and transmitting to the control server, the permission request information for making a setting request for the new travel-permitted region. the control server comprising a travel-permitted region setting unit receiving a permission request information for the working machine; said control server, responsive to the permission request information setting a region in the travel route, for which a travel permission has been given only to the working machine, as a travel-permitted region and generating permission response information including position information of the travel-permitted region; said control server further comprising: a no-handover zone setting unit setting a travel permission requesting zone out of the travel-permitted region as a no-handover zone, in which zone, the working machine makes a setting request to the control server for setting a new travel-permitted region as a no-handover zone in which switching of a connected base station from the first wireless base station to the second wireless base station is prohibited, a switching operation control unit generating switching operation control information for allowing the working machine to perform switching of the connected base station outside the no-handover zone, and a server-side communication control unit transmitting the switching operation control information to the working machine; and the on-board terminal equipment comprising: a terminal-side communication control unit receiving the switching operation control information, and based on the switching operation control information, switching the connected wireless base station (41-1, 41-2) in a zone other than the no-handover zone, and transmitting to the control server, the permission request information for making a setting request for the new travel-permitted region. a terminal-side communication control unit receiving the switching operation control information, and based on the switching operation control information, switching the connected wireless base station (41-1, 41-2) in a zone other than the no-handover zone, and transmitting to the control server, the permission request information for making a setting request for the new travel-permitted region.