PROBLEM TO BE SOLVED: To provide a novel hearing aid which allows a user to clearly hear necessary sounds, while blocking noise.SOLUTION: A hearing aid 10 includes a cylindrical aid body 20 to be inserted into an external auditory meatus 41. The aid body 20 has an outer surface which is formed to be brought into substantial contact with an inner wall of the external auditory meatus 41 when inserted thereto. The aid body 20 has an opening 21 formed at an insertion end and another opening 22 formed at the other end, which are in communication with each other with substantially no constriction.SELECTED DRAWING: Figure 3【課題】騒音を遮断しつつも、必要な音声については明瞭に聴き取ることを可能にする新規の補聴器具を提供する。【解決手段】外耳道４１に挿入する筒状の器具本体２０を備え、前記器具本体２０の外面は、前記器具本体２０を外耳道４１に挿入したとき、外耳道４１の内壁に略密着するような形状をなし、前記器具本体２０の挿入端側の開口部２１及び反挿入端側の開口部２２が実質的に狭窄することなく連通していることを特徴とする、補聴器具１０。【選択図】図３
