A noise control device for reducing a given noise in an aircraft arriving at a control point by radiating a control sound toward the control point, the noise control device comprising: a controlling noise detector for detecting the given noise and outputting a controlling noise signal (n1-n20); a control filter for processing the controlling noise signal (n1-n20) supplied from the controlling noise detector by using a fixed filter coefficient set in advance, and thereby outputting a control signal; a control speaker radiating a control sound based on the control signal supplied from the control filter for reducing the given noise arriving at the control point; an error detector placed at the control point for detecting an error signal (e1-e4) between the noise and the control sound that is supplied from the control speaker; characterised by further comprising a signal memory configured to store the controlling noise signal (n1-n20) supplied from the controlling noise detector and the error signal (e1-e4) detected by the error detector for a given time; a filter coefficient calculator for calculating a filter coefficient by using both the controlling noise signal (n1-n20) and the error signal (e1-e4) stored in the signal memory after storing both the controlling noise signal (n1-n20) and the error signal (e1-e4) in the signal memory at a given timing; and a filter coefficient renewing section configured to read the filter coefficient calculator and to renew the fixed filter coefficient set in advance to the filter coefficient calculated by the filter coefficient calculator, the filter coefficient calculated independently and regardless of the real-time work of the control filter. a controlling noise detector for detecting the given noise and outputting a controlling noise signal (n1-n20); a control filter for processing the controlling noise signal (n1-n20) supplied from the controlling noise detector by using a fixed filter coefficient set in advance, and thereby outputting a control signal; a control speaker radiating a control sound based on the control signal supplied from the control filter for reducing the given noise arriving at the control point; an error detector placed at the control point for detecting an error signal (e1-e4) between the noise and the control sound that is supplied from the control speaker; characterised by further comprising a signal memory configured to store the controlling noise signal (n1-n20) supplied from the controlling noise detector and the error signal (e1-e4) detected by the error detector for a given time; a filter coefficient calculator for calculating a filter coefficient by using both the controlling noise signal (n1-n20) and the error signal (e1-e4) stored in the signal memory after storing both the controlling noise signal (n1-n20) and the error signal (e1-e4) in the signal memory at a given timing; and a filter coefficient renewing section configured to read the filter coefficient calculator and to renew the fixed filter coefficient set in advance to the filter coefficient calculated by the filter coefficient calculator, the filter coefficient calculated independently and regardless of the real-time work of the control filter.