The device for estimating charged state

And the battery capacity, and the previous value of the state of charge estimate the flow and the current to and from the charge state calculated based on the between the current control device 3 and the power storage device 1 for controlling the charging and discharging of the power storage device 1 a first calculation unit 30 for calculating the present value of the estimated value as the first state of charge estimate, at the time of constant current control, the state of charge estimated value calculated based on the voltage of the equivalent circuit model and the battery of the battery first while calculating the current value of the second charging state estimate, at the time of the constant voltage control, based on the voltage of the equivalent circuit model and the battery of the battery, the current state of charge estimated value calculated in consideration of the change in resistance of the battery charging with a second calculation unit 31 for calculating a value as a second charge state estimate, a correction operation unit 32 which periodically corrects the first charged state estimating value in the second state of charge estimate the state estimation device.