A vehicle body member (20, 30) having a charging and discharging function, the vehicle body member (20, 30) comprising: a first cell unit comprised of a first negative electrode part and a first positive electrode part disposed in contact with a first surface of the first negative electrode part, the first negative electrode part including carbon fiber and the first positive electrode part including a first positive electrode active material and a first solid electrolyte, wherein at least one first via hole passes through the first negative electrode part and the first positive electrode part; a second cell unit comprised of a second negative electrode part and a second positive electrode part disposed in contact with a first surface of the second negative electrode part, the second negative electrode part including carbon fiber and the second positive electrode part including a second positive electrode active material and a second solid electrolyte, wherein at least one second via hole passes through the second negative electrode part and the second positive electrode part; a reinforcing insulating layer formed in a honeycomb structure and having opposite surfaces, each of the opposite surfaces provided with at least one insertion protrusion inserted into each of the first via hole and the second via hole respectively, the reinforcing insulating layer interposed between a first surface of the first cell unit and a second surface of the second cell unit to electrically insulate the first and second cell units (100, 200) from each other; a first positive electrode current collector connected to the first positive electrode part of the first cell unit; a second positive electrode current collector connected to the second positive electrode part of the second cell unit and connected in parallel to the first positive electrode current collector; a first negative electrode current collector connected to the first negative electrode part of the first cell unit; and a second negative electrode current collector connected to the second negative electrode part of the second cell unit and connected in parallel to the first negative electrode current collector. a first cell unit comprised of a first negative electrode part and a first positive electrode part disposed in contact with a first surface of the first negative electrode part, the first negative electrode part including carbon fiber and the first positive electrode part including a first positive electrode active material and a first solid electrolyte, wherein at least one first via hole passes through the first negative electrode part and the first positive electrode part; a second cell unit comprised of a second negative electrode part and a second positive electrode part disposed in contact with a first surface of the second negative electrode part, the second negative electrode part including carbon fiber and the second positive electrode part including a second positive electrode active material and a second solid electrolyte, wherein at least one second via hole passes through the second negative electrode part and the second positive electrode part; a reinforcing insulating layer formed in a honeycomb structure and having opposite surfaces, each of the opposite surfaces provided with at least one insertion protrusion inserted into each of the first via hole and the second via hole respectively, the reinforcing insulating layer interposed between a first surface of the first cell unit and a second surface of the second cell unit to electrically insulate the first and second cell units (100, 200) from each other; a first positive electrode current collector connected to the first positive electrode part of the first cell unit; a second positive electrode current collector connected to the second positive electrode part of the second cell unit and connected in parallel to the first positive electrode current collector; a first negative electrode current collector connected to the first negative electrode part of the first cell unit; and a second negative electrode current collector connected to the second negative electrode part of the second cell unit and connected in parallel to the first negative electrode current collector.