A hearing assistance device which is worn by the user and which can suppress the voices produced by the user wearing the hearing assistance device is provided. When the user wears the hearing assistance device 1, a pair of microphones is separated and positioned on both sides of a head of the user and a pair of speakers is separated and positioned on both ears of the user or positioned near the ears and which emits sound. The hearing assistance device includes a noise canceller 96 which subtracts a signal processed by a mouth directivity sound processor 93 from the input signal from at least one of the microphones L and R, in which the mouth directivity sound processor 93 emphasizes voice produced from a sound source positioned at a mouth of the user.