A charging device for charging a power storage device, comprising: an electric power feeding device configured to feed charging power to the power storage device, using electric power from a power supply; and a control device configured to set a charging start time using an estimated charging time in accordance with a charging end time which is input by a user, and to cause the electric power feeding device to perform a charging operation of charging the power storage device, the control device configured to perform learning control for a parameter relevant to a factor which affects estimation of the charging time, and to estimate the charging time using a learned value of the parameter under the learning control, the parameter including a parameter relevant to a state of degradation of a charging capacity of the power storage device, and the parameter being determined based on a reference amount of electric power with which the power storage device in a state of charge before start of a charging operation is chargeable, and an actual amount of electric power with which the power storage device is actually charged, characterized in that the reference amount of electric power is a variation in amount of electric power with which the power storage device is charged, between the state of charge before start of a charging operation and a theoretical charging capacity of the power storage device, the parameter is defined as a ratio of the actual amount of electric power to the reference amount of electric power, and the control device estimates the charging time, using the theoretical charging capacity, the learned value of the parameter, and charging power fed from the electric power feeding device. an electric power feeding device configured to feed charging power to the power storage device, using electric power from a power supply; and a control device configured to set a charging start time using an estimated charging time in accordance with a charging end time which is input by a user, and to cause the electric power feeding device to perform a charging operation of charging the power storage device, the control device configured to perform learning control for a parameter relevant to a factor which affects estimation of the charging time, and to estimate the charging time using a learned value of the parameter under the learning control, the parameter including a parameter relevant to a state of degradation of a charging capacity of the power storage device, and the parameter being determined based on a reference amount of electric power with which the power storage device in a state of charge before start of a charging operation is chargeable, and an actual amount of electric power with which the power storage device is actually charged, characterized in that the reference amount of electric power is a variation in amount of electric power with which the power storage device is charged, between the state of charge before start of a charging operation and a theoretical charging capacity of the power storage device, the parameter is defined as a ratio of the actual amount of electric power to the reference amount of electric power, and the control device estimates the charging time, using the theoretical charging capacity, the learned value of the parameter, and charging power fed from the electric power feeding device.