A sound collecting device and a hearing aid that can be manufactured at a low cost with a simple structure and can reliably collect sound waves radiated from a wide range without having to be directly attached to the body of a listener. An object is to provide an apparatus. A hearing aid device 1 includes a sound collector 2 attached to a chair body 3. The sound collector 2 includes a first reflecting plate 21 and a second reflecting plate 22 that are substantially curved. The first reflecting plate 21 and the second reflecting plate 22 are partially parabolic curved surfaces obtained by cutting a part so as to include a rotational axis of a rotating parabolic curved surface obtained by rotating a rotating shaft of a parabola based on a predetermined focal point, Or it is comprised from the partial rotation elliptical curved surface which partly cut out so that the rotation axis of the rotation elliptical curved surface which rotated the rotation axis of the ellipse based on a predetermined focus may be included.【課題】簡素な構造により低コストで製造することができるとともに、被聴者の身体に直接装着する必要がなく、広範囲から放射される音波を確実に集音することができる集音具、及び補聴装置を提供することを目的とする。【解決手段】補聴装置１は椅子体３に取り付けられた集音具２を備える。集音具２は、略湾曲状の第１の反射板２１、及び第２の反射板２２から構成されている。第１の反射板２１、及び第２の反射板２２は、所定の焦点に基づく放物線の回転軸を回転させた回転放物曲面の回転軸を含むように一部を切り取った部分放物曲面、又は所定の焦点に基づく楕円の回転軸を回転させた回転楕円曲面の回転軸を含むように一部を切り取った部分回転楕円曲面から構成される。
