To provide a sound elimination system which can specify the frequency band of noise to be eliminated, can be made advantageous in cost by simplifying active sound elimination constitution, and can excellently perform active sound elimination.

Part of the space in a large-diameter duct is divided into plural small-diameter ducts 1A, 1B, 1C, and 1D and only one representative small- diameter duct 1A is provided with an adaptive control arithmetic part 50 which calculates a signal generation filter for sound elimination. For other nonrepresentative small-diameter ducts, the signal generation filter for sound elimination which is calculated by the adaptive control arithmetic part 50 is used and the detection outputs of 1st sensors 2A, 2B, 2C and 2D installed in the small-diameter ducts 1A, 1B, 1C, and 1D are convoluted corresponding to one another.