An assembling method of an electric vehicle in which a battery unit including a battery as an electric power supply for an electric motor which generates a driving power transmitted to wheels (13, 14) is mounted to a vehicle body including a frame, the wheels (13, 14), and the electric motor, the vehicle body being capable of being moved with hands of an operator and of changing a moving direction of the vehicle body, in a state in which the operator is gripping a steering handle, the assembling method comprising the steps of: assembling the vehicle body in a vehicle body assembling place; conducting a vehicle body test in a vehicle body test place in a state in which the battery unit is not mounted to the vehicle body, the vehicle body test including confirmation of a state of driving power transmission from the electric motor to the wheels (13, 14) by connecting an electric power supply unit installed in the vehicle body test place to the electric motor of the vehicle body and supplying electric power from the electric power supply unit to the electric motor; detaching the electric power supply unit from the electric motor and transporting the vehicle body which has passed the vehicle body test from the vehicle body test place to a mounting place, in a state in which the battery unit is not mounted to the vehicle body; and mounting the battery unit to the transported vehicle body, in the mounting place, wherein the vehicle body assembling place and the vehicle body test place are a vehicle body manufacturing factory for manufacturing the vehicle body, and wherein the mounting place is placed at a location that is geographically different from a location of the vehicle body manufacturing factory and is geographically closer to a location at which the electric vehicle is provided to the customer than the vehicle body manufacturing factory is. assembling the vehicle body in a vehicle body assembling place; conducting a vehicle body test in a vehicle body test place in a state in which the battery unit is not mounted to the vehicle body, the vehicle body test including confirmation of a state of driving power transmission from the electric motor to the wheels (13, 14) by connecting an electric power supply unit installed in the vehicle body test place to the electric motor of the vehicle body and supplying electric power from the electric power supply unit to the electric motor; detaching the electric power supply unit from the electric motor and transporting the vehicle body which has passed the vehicle body test from the vehicle body test place to a mounting place, in a state in which the battery unit is not mounted to the vehicle body; and mounting the battery unit to the transported vehicle body, in the mounting place, wherein the vehicle body assembling place and the vehicle body test place are a vehicle body manufacturing factory for manufacturing the vehicle body, and wherein the mounting place is placed at a location that is geographically different from a location of the vehicle body manufacturing factory and is geographically closer to a location at which the electric vehicle is provided to the customer than the vehicle body manufacturing factory is.