An active noise control device configured to reduce a noise, the active noise control device comprising: a control frequency determinator operable to determine a frequency of the noise; a reference cosine-wave generator configured to generate a reference cosine-wave signal having the determined frequency; a reference sine-wave generator configured to generate a reference sine-wave signal having the determined frequency; a first one-tap adaptive filter adapted to receive the reference cosine-wave signal, the first one-tap adaptive filter having a first filter coefficient; a second one-tap adaptive filter adapted to receive the reference sine-wave signal, the second one-tap adaptive filter having a second filter coefficient; an adder configured to add an output signal from the first one-tap adaptive filter to an output signal from the second one-tap adaptive filter; a secondary noise generator configured to being driven by an output signal from the adder as to generate a secondary noise; a residual sound detector operable to detect a residual sound generated by interference between the secondary noise and the noise; a simulation signal generator adapted to output a simulation cosine-wave signal and a simulation sine-wave signal obtained by correcting the reference cosine-wave signal and the reference sine-wave signal with a characteristic simulating a transfer characteristic from the secondary noise generator to the residual sound detector; a filter coefficient updating unit configured to update the first filter coefficient and the second filter coefficient characterized by the filter coefficient updating unit comprising: a first filter coefficient updater operable to update the first filter coefficient and the second filter coefficient based on the output signal from the residual sound detector and the output signal from the simulation signal generator with use of none of the reference cosine-wave signal, the reference sine-wave signal, and the output signal from the adder; and a second filter coefficient updater operable to update the first filter coefficient and the second filter coefficient based on the reference cosine-wave signal, the reference sine-wave signal, and the output signal from the adder with use of none of the output signal from the residual sound detector and the output signal from the simulation signal generator. a control frequency determinator operable to determine a frequency of the noise; a reference cosine-wave generator configured to generate a reference cosine-wave signal having the determined frequency; a reference sine-wave generator configured to generate a reference sine-wave signal having the determined frequency; a first one-tap adaptive filter adapted to receive the reference cosine-wave signal, the first one-tap adaptive filter having a first filter coefficient; a second one-tap adaptive filter adapted to receive the reference sine-wave signal, the second one-tap adaptive filter having a second filter coefficient; an adder configured to add an output signal from the first one-tap adaptive filter to an output signal from the second one-tap adaptive filter; a secondary noise generator configured to being driven by an output signal from the adder as to generate a secondary noise; a residual sound detector operable to detect a residual sound generated by interference between the secondary noise and the noise; a simulation signal generator adapted to output a simulation cosine-wave signal and a simulation sine-wave signal obtained by correcting the reference cosine-wave signal and the reference sine-wave signal with a characteristic simulating a transfer characteristic from the secondary noise generator to the residual sound detector; a filter coefficient updating unit configured to update the first filter coefficient and the second filter coefficient characterized by the filter coefficient updating unit comprising: a first filter coefficient updater operable to update the first filter coefficient and the second filter coefficient based on the output signal from the residual sound detector and the output signal from the simulation signal generator with use of none of the reference cosine-wave signal, the reference sine-wave signal, and the output signal from the adder; and a second filter coefficient updater operable to update the first filter coefficient and the second filter coefficient based on the reference cosine-wave signal, the reference sine-wave signal, and the output signal from the adder with use of none of the output signal from the residual sound detector and the output signal from the simulation signal generator. a first filter coefficient updater operable to update the first filter coefficient and the second filter coefficient based on the output signal from the residual sound detector and the output signal from the simulation signal generator with use of none of the reference cosine-wave signal, the reference sine-wave signal, and the output signal from the adder; and a second filter coefficient updater operable to update the first filter coefficient and the second filter coefficient based on the reference cosine-wave signal, the reference sine-wave signal, and the output signal from the adder with use of none of the output signal from the residual sound detector and the output signal from the simulation signal generator.