An active vibration noise reduction device includes: a speaker that outputs a cancellation sound for canceling noise; a microphone that generates an error signal from the noise and the cancellation sound; a control filter configured to generate a control signal for controlling the cancellation sound from a reference signal; and a secondary path filter presenting an estimation value of a transfer function from the speaker to the microphone, wherein the control filter is configured to be adaptively updated by an update amount obtained by multiplying the error signal, a step size parameter calculated based on the error signal, and a result of convolution between the reference signal and the secondary path filter.