A train information transmitting and receiving system comprising: information transmitting and receiving apparatuses that are mountable on each of a plurality of vehicles constituting a train and perform a train information process in coordination with each other; first and second vehicle-side connectors (21a, 22a) that are respectively set on both ends of each of the vehicles and respectively have a ground terminal (21b, 22b) that is grounded to each of the vehicles and a plurality of signal transmission-path terminals (21c, 22c); first and second in-vehicle wiring cables (21, 22) that have a plurality of signal transmission paths that respectively connect the plurality of respective signal transmission-path terminals, of the first and second vehicle-side connectors (21a, 22a) and the information transmitting and receiving apparatuses, and shielding layers that are grounded to the vehicles and shield the signal transmission paths; and a vehicle connection cable that is mounted, at both ends, with first and second connectors (61, 62) that respectively have connection ground terminals (61b, 62b) and a plurality of connection-signal transmission-path terminals (61c, 62c) configured to be respectively engaged with ground terminals (21b, 22b) and with a plurality of signal transmission-path terminals (21c, 22c) of the first and second vehicle-side connectors (21a, 22a), and has a plurality of connection-signal transmission paths that connect the connection-signal transmission-path terminals (61c, 62c) of the first and second connectors (61, 62), and has a single shielding layer that shields a whole of the connection-signal transmission paths by surrounding the whole of the connection-signal transmission paths and is connected to any one but only one of the respective connection ground terminals (61b, 62b) of the first and second connectors (61, 62), wherein a transmission path between adjacent vehicles (201, 201) is constituted by connecting the first vehicle-side connector of one of the adjacent vehicles (201, 201) with the first connector of the vehicle connection cable and connecting the second vehicle-side connector of another one of the adjacent vehicles (201, 201) with the second connector of the vehicle connection cable. information transmitting and receiving apparatuses that are mountable on each of a plurality of vehicles constituting a train and perform a train information process in coordination with each other; first and second vehicle-side connectors (21a, 22a) that are respectively set on both ends of each of the vehicles and respectively have a ground terminal (21b, 22b) that is grounded to each of the vehicles and a plurality of signal transmission-path terminals (21c, 22c); first and second in-vehicle wiring cables (21, 22) that have a plurality of signal transmission paths that respectively connect the plurality of respective signal transmission-path terminals, of the first and second vehicle-side connectors (21a, 22a) and the information transmitting and receiving apparatuses, and shielding layers that are grounded to the vehicles and shield the signal transmission paths; and a vehicle connection cable that is mounted, at both ends, with first and second connectors (61, 62) that respectively have connection ground terminals (61b, 62b) and a plurality of connection-signal transmission-path terminals (61c, 62c) configured to be respectively engaged with ground terminals (21b, 22b) and with a plurality of signal transmission-path terminals (21c, 22c) of the first and second vehicle-side connectors (21a, 22a), and has a plurality of connection-signal transmission paths that connect the connection-signal transmission-path terminals (61c, 62c) of the first and second connectors (61, 62), and has a single shielding layer that shields a whole of the connection-signal transmission paths by surrounding the whole of the connection-signal transmission paths and is connected to any one but only one of the respective connection ground terminals (61b, 62b) of the first and second connectors (61, 62), wherein a transmission path between adjacent vehicles (201, 201) is constituted by connecting the first vehicle-side connector of one of the adjacent vehicles (201, 201) with the first connector of the vehicle connection cable and connecting the second vehicle-side connector of another one of the adjacent vehicles (201, 201) with the second connector of the vehicle connection cable.