An active noise control apparatus, comprising: a plurality of active noise controllers (11 through 14) having a plurality of adaptive notch filters (31 through 34) for generating a plurality of canceling signals (Sc1 through Sc4) having a plurality of amplitudes (A1 through A4) calculated based on filter coefficient (W1 through W4) of the adaptive notch filters (31 through 34) respectively for a plurality of noise types; a mixer configured to mix the canceling signals (Sc1 through Sc4) into a mixed canceling signal; a canceling sound output unit configured to output a canceling sound based on the mixed canceling signal; and an amplitude suppressor configured to suppress the amplitude (A1, A2, A3, A4) of at least one of the canceling signals (Sc1 through Sc4) depending on a noise reduction priority sequence preset for the noise types; characterized in that the amplitude suppressor is configured to update a remaining output range (DRr) of the mixer each time one of the amplitudes (A1 through A4) of the canceling signals (Sc1 through Sc4) generated respectively by the active noise controllers (11 through 14) is assigned to the output range of the mixer in a descending order of the noise types according to the noise reduction priority sequence (DRr ← DRr - A: in the order of A1, A2, A3 and A4), by subtracting the one of the amplitudes (A1 through A4) from the output range of the mixer at the time, and to perform a forgetting process for bringing the amplitude (A1, A2, A3 and A4) of one of the canceling signals (Sc2 through Sc4) to zero by fading out the filter coefficient (W1 through W4) to zero, the one of the canceling signals being provided for the noise types which cannot be assigned within the remaining output range (DRr) of the mixer. a plurality of active noise controllers (11 through 14) having a plurality of adaptive notch filters (31 through 34) for generating a plurality of canceling signals (Sc1 through Sc4) having a plurality of amplitudes (A1 through A4) calculated based on filter coefficient (W1 through W4) of the adaptive notch filters (31 through 34) respectively for a plurality of noise types; a mixer configured to mix the canceling signals (Sc1 through Sc4) into a mixed canceling signal; a canceling sound output unit configured to output a canceling sound based on the mixed canceling signal; and an amplitude suppressor configured to suppress the amplitude (A1, A2, A3, A4) of at least one of the canceling signals (Sc1 through Sc4) depending on a noise reduction priority sequence preset for the noise types; characterized in that the amplitude suppressor is configured to update a remaining output range (DRr) of the mixer each time one of the amplitudes (A1 through A4) of the canceling signals (Sc1 through Sc4) generated respectively by the active noise controllers (11 through 14) is assigned to the output range of the mixer in a descending order of the noise types according to the noise reduction priority sequence (DRr ← DRr - A: in the order of A1, A2, A3 and A4), by subtracting the one of the amplitudes (A1 through A4) from the output range of the mixer at the time, and to perform a forgetting process for bringing the amplitude (A1, A2, A3 and A4) of one of the canceling signals (Sc2 through Sc4) to zero by fading out the filter coefficient (W1 through W4) to zero, the one of the canceling signals being provided for the noise types which cannot be assigned within the remaining output range (DRr) of the mixer.