To provide a noise reducing device capable of controlling perception of noise.

The noise reducing device is equipped with a bone conduction microphones 21 for detecting a bone conduction sound transmitted from a noise source through a human body, a bone conduction speakers 22 for transmitting a bone conduction interference sound to the human body, and a control means 2 which has a digital filter 25 for converting and processing an input signal from the bone conduction microphones 21 to a signal with the same amplitude and reverse phase and generates the bone conduction interference sound based on the signal after conversion and processing.