An output control device for a wind farm including a plurality of wind power generation devices, wherein the wind power generation devices are connected to a power system via a power line, the output control device being configured to receive data transmitted from a supplied power data detecting unit provided at a connection point between the power line and the power system, the data including a power amount output by the wind farm; the output control device comprising: a potential estimator configured to be connected to a detector of each wind power generation device, to receive an effective power output (Pwl to Pwn) and pitch angle (βw1 to βwn) of each wind power generation device and to estimate an outputtable maximum power amount by each wind power generation device and a total maximum power amount outputtable by the wind farm; a control amount determiner configured to calculate a control amount of the wind farm based on the total maximum power amount estimated by the potential estimator and based on a deviation between a power target value and the power amount output by the wind farm; a control timing adjuster configured to adjust a control timing of the control amount of the wind farm so as to compensate a transmission delay of the data transmitted from the supplied power data detecting unit and delay components caused at the time of calculation of the control amount by performing on the deviation phase delay compensation; and a control amount distributor configured to distribute the control amount having undergone the control timing adjustment based on the outputtable maximum power amount of each wind power generation device; wherein the control timing adjuster comprises: a first delay phase compensator (127b1); and a second delay phase compensator configured to perform phase delay compensation on the deviation having undergone phase delay compensation by the first delay phase compensator (127b1); wherein the first delay phase compensator and the second delay phase compensator (127b2) are configured so that phase delay compensation is performed through respective transfer functions, each having time constants to compensate a phase delay originating from a respective one of two factors. a potential estimator configured to be connected to a detector of each wind power generation device, to receive an effective power output (Pwl to Pwn) and pitch angle (βw1 to βwn) of each wind power generation device and to estimate an outputtable maximum power amount by each wind power generation device and a total maximum power amount outputtable by the wind farm; a control amount determiner configured to calculate a control amount of the wind farm based on the total maximum power amount estimated by the potential estimator and based on a deviation between a power target value and the power amount output by the wind farm; a control timing adjuster configured to adjust a control timing of the control amount of the wind farm so as to compensate a transmission delay of the data transmitted from the supplied power data detecting unit and delay components caused at the time of calculation of the control amount by performing on the deviation phase delay compensation; and a control amount distributor configured to distribute the control amount having undergone the control timing adjustment based on the outputtable maximum power amount of each wind power generation device; wherein the control timing adjuster comprises: a first delay phase compensator (127b1); and a second delay phase compensator configured to perform phase delay compensation on the deviation having undergone phase delay compensation by the first delay phase compensator (127b1); wherein the first delay phase compensator and the second delay phase compensator (127b2) are configured so that phase delay compensation is performed through respective transfer functions, each having time constants to compensate a phase delay originating from a respective one of two factors. a first delay phase compensator (127b1); and a second delay phase compensator configured to perform phase delay compensation on the deviation having undergone phase delay compensation by the first delay phase compensator (127b1); wherein the first delay phase compensator and the second delay phase compensator (127b2) are configured so that phase delay compensation is performed through respective transfer functions, each having time constants to compensate a phase delay originating from a respective one of two factors.