Disclosed are a charger and a method of charging an electric vehicle. A main body of the charger includes a plurality of sub main bodies coupled to each other to transform its shape. The charger with the main body having a first shape moves toward the electric vehicle, and is then transformed to have a second shape. The first shape refers to a shape allowing the main body to be movable on a ground, and the second shape refers to a shape making the main body occupy a smaller surrounding area of the electric vehicle than the first shape. The electric vehicle is charged as connected to the charger having the second shape. The charger does not obstruct traffic of other vehicles because its size is reduced during charging.