A device for controlling a charge and discharge of a storage battery in a wind-driven electricity generation system of a type having the storage battery which has a wind-driven electricity generator, driven by a wind power, for generating a power to be supplied to a power circuit, and the storage battery for charging/discharging a part of the power generated by the wind-driven electricity generator, comprising: an instantaneous response detecting portion for sequentially detecting, as an instantaneous response element, an instantaneous value of a quantity of a power generated by the wind-driven electricity generator; a variation calculating portion for calculating a variation per unit time of the instantaneous response element which is detected by the instantaneous response detecting portion; a charge and discharge control portion for controlling the charge and discharge of the storage battery depending on a fluctuation in the instantaneous response element detected by the instantaneous response detecting portion; a pattern information storing portion for storing plural kinds of pattern information related to an instantaneous response control region representing a capacity of the storage battery which is to be assigned to the control of the charge and discharge of the storage battery depending on the fluctuation in the instantaneous response element; and a pattern information selecting portion for selecting one of the plural kinds of pattern information (A, B, C) stored in the pattern information storing portion and applying the pattern information to the control of the charge and discharge of the storage battery through the charge and discharge control portion based on the variation per unit time of the instantaneous response element which is calculated by the variation calculating portion. an instantaneous response detecting portion for sequentially detecting, as an instantaneous response element, an instantaneous value of a quantity of a power generated by the wind-driven electricity generator; a variation calculating portion for calculating a variation per unit time of the instantaneous response element which is detected by the instantaneous response detecting portion; a charge and discharge control portion for controlling the charge and discharge of the storage battery depending on a fluctuation in the instantaneous response element detected by the instantaneous response detecting portion; a pattern information storing portion for storing plural kinds of pattern information related to an instantaneous response control region representing a capacity of the storage battery which is to be assigned to the control of the charge and discharge of the storage battery depending on the fluctuation in the instantaneous response element; and a pattern information selecting portion for selecting one of the plural kinds of pattern information (A, B, C) stored in the pattern information storing portion and applying the pattern information to the control of the charge and discharge of the storage battery through the charge and discharge control portion based on the variation per unit time of the instantaneous response element which is calculated by the variation calculating portion.