LOWER VEHICLE-BODY STRUCTURE OF AN ELECTRIC VEHICLE, VEHICLE-BODY STRUCTURE OF AN ELECTRIC VEHICLE, AND ELECTRIC VEHICLE

To increase the resistance to lateral collision and to also improve the front-end collision load transfer performance of a tunnel 9 of a lower vehicle-body structure of an electric vehicle the lower vehicle-body structure includes: a floor 4 having the tunnel 9 formed in a front part at a middle in a vehicle-width direction; and a floor cross member 18 spanning, above the floor 4, between side sills 10, 10 disposed on opposite sides of the floor 4, a rear end of the tunnel 9 is located directly in front of the floor cross member 18, and reinforcing brackets 30, 40 are provided extending from the tunnel 9 toward an upper end of the floor cross member 18 and connected to the upper end of the floor cross member 18.