A stylus pen for use with a charging base is provided. The stylus pen includes a pen body, a pen tip, a battery, a first receiving end conductive structure, and a second receiving end conductive structure. The pen body includes an opening to connect to the charging base. The pen tip is connected to the pen body. The battery is disposed in the pen body. The first receiving end conductive structure and the second receiving end conductive structure are disposed in the opening, and are respectively electrically connected to the battery.