An electric component (electric-power convertor) and a pair of air-conditioning ducts are arranged side by side in a vehicle width direction. In case in which a rear end portion of the electric component is located in back of an outlet of the air-conditioning duct, the electric component is formed in a notch shape such that a duct-side edge portion thereof extends obliquely rearward and in a specified direction, in the vehicle width direction, away from the air-conditioning duct. Accordingly, it can be properly prevented that a conditioning air toward a passenger seated in a rear seat is blocked with the electric component arranged between a seat cushion of a front seat and a floor panel and receives any improper influence of heat emitted by the electric component, or the electric component receives any damage from the conditioning air.