LOWER STRUCTURE OF VEHICLE

A lower structure of a vehicle includes front side frames, a vehicle body strength member, a floor panel, and a power supply unit, in which the front side frames are formed to have cross-sectional shapes that open upward at least at rear sections thereof, the power supply unit is disposed below a floor panel, the floor panel includes a pair of reinforcing panel portions which are respectively joined to the rear sections of the front side frames and cover the rear sections from above, and a floor panel main body portion which constitutes a portion other than the reinforcing panel portions, and the reinforcing panel portions are formed to have higher strength than the floor panel main body portion.