Active noise cancellation device

there is provided an active noise cancellation apparatus, which is capable of road noise by a technique that is not mounting a vibration generator to a floor panel itself, or another plate-like inner part itself, to reliably reduce while reducing the cost and size of the device. A reference signal detector is mounted on a knuckle, and the vibration generator is mounted to a wheel housing or a suspension member. An error signal detector detects a vibration of the wheel housing or a vibration of the suspension member as an error signal or recorded sound in a vehicle interior as an error signal. A control or regulation controls or regulates the vibration generator on the basis of the reference signal and the error signal so as to reduce the error signal.