A charging device is provided with a charger, a charging time setting unit and a usage latency calculation unit. The charger is configured to charge a vehicle battery. The charging time setting unit sets a charging time for charging the vehicle battery. The usage latency calculation unit calculates a latency of usage of the charger. The usage latency is a time between an end time of charging of a first vehicle connected to the charger and a start time of charging of a second vehicle connected to the charger and charged after the first vehicle. The charging time setting unit compares the usage latency with a first threshold time and a second threshold time shorter than the first threshold time. The charging time setting unit sets the charging time in accordance with whether or not the usage latency is between the first and second threshold times.