A vehicle comprising: battery modules (13FL,13FR,13CL,13CR,13R) connected to motor power supply cables which come from an electric motor for travelling, located below a floor panel of the vehicle, and including, in the order from a front of the vehicle, a first battery module (13FL,13FR) located below a front seat, a second battery module (13CL,13CR) located below the floor panel at a position under a feet area of a rear seat between the front seat and the rear seat and having a height lower than a height of the first battery module (13FL,13FR), and a third battery module located below the rear seat and having a height higher than the height of the first battery module (13FL,13FR), characterized by a thin heater module (24L,24R) for preventing the third battery module from being frozen which is provided in each of two end regions, exclusive of a middle region, in a vehicle width direction, located above the third battery module in a vehicle up-down direction, in such a way as to be opposed to a top surface of the third battery module, and configured to heat the third battery module through the top surface, wherein each thin heater module (24L,24R) is a PTC heater configured to vary its resistance value to keep a predetermined temperature once the heater is heated to this temperature after powered on and configured to be capable of heating a region of a set area evenly by combination of this PTC heater and a uniform heat distribution plate. battery modules (13FL,13FR,13CL,13CR,13R) connected to motor power supply cables which come from an electric motor for travelling, located below a floor panel of the vehicle, and including, in the order from a front of the vehicle, a first battery module (13FL,13FR) located below a front seat, a second battery module (13CL,13CR) located below the floor panel at a position under a feet area of a rear seat between the front seat and the rear seat and having a height lower than a height of the first battery module (13FL,13FR), and a third battery module located below the rear seat and having a height higher than the height of the first battery module (13FL,13FR), a first battery module (13FL,13FR) located below a front seat, a second battery module (13CL,13CR) located below the floor panel at a position under a feet area of a rear seat between the front seat and the rear seat and having a height lower than a height of the first battery module (13FL,13FR), and a third battery module located below the rear seat and having a height higher than the height of the first battery module (13FL,13FR), characterized by a thin heater module (24L,24R) for preventing the third battery module from being frozen which is provided in each of two end regions, exclusive of a middle region, in a vehicle width direction, located above the third battery module in a vehicle up-down direction, in such a way as to be opposed to a top surface of the third battery module, and configured to heat the third battery module through the top surface, wherein each thin heater module (24L,24R) is a PTC heater configured to vary its resistance value to keep a predetermined temperature once the heater is heated to this temperature after powered on and configured to be capable of heating a region of a set area evenly by combination of this PTC heater and a uniform heat distribution plate.