PROBLEM TO BE SOLVED: To reduce power consumption at a desired ratio in response to an operating state of an air conditioner varying from hour to hour.SOLUTION: An energy saving control device includes: a current sensor 3 measuring an input current input to an outdoor unit 7 of an air conditioner, the outdoor unit 7 including an inverter compressor 5; and a controller 4 controlling the inverter compressor 5 if a reduction command to reduce power consumption of the outdoor unit 7 and information on a reduction amount by which the power consumption is reduced are acquired, the controller 4 controlling the inverter compressor 5 in such a manner that a predetermined current amount is determined so that a sum of the power consumption in a first period and the power consumption in a second period is lower than that in a case of not reducing the power consumption by the reduction amount and that the first period and the second period for reducing the input current by the determined predetermined current amount are alternately repeated, the first period being a period in which the inverter compressor 5 is controlled to reduce the measured input current by the predetermined current amount, and the second period being a period in which an input current reduction control is cancelled.
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