Japanese “HIBIKI” and “UNARI” for Sound of Wind Bells-Study on Japanese Sensitivity to Sound of Wind Bells-Traditional Japanese houses was built by wood and paper; therefore, the inside and outside sound easily passes through and coexists. In the case of modern houses, indoors and outdoors are separated by thick walls like concrete, so the outside sound does not easily enter the space in a building, making it a highly sealed space. Further, illumination and ventilation use lighting and air-conditioning, resulting in less opportunities to feel the seasons by opening curtains and windows. This also influences wind bells (Furin) which are thought to be a noise, and some people refrain from hanging them. In recent years, desktop wind bells are being sold as indoor decorations and to enjoy wind bells indoors as sound toys or musical instruments.In this study, psychological and physical evaluation toward the sound of wind bells is described. Japanese “HIBIKI” has two meanings, which are length of sound decay time and reverberation time in a space. According to factor analysis, “HIBIKI” is contained in not the space factor but the “beauty/lyrical factor”, therefore, its meaning is length of sound decay this time.In psychological evaluation, “HIBIKI” is one of the important factors to evaluate the sound of wind bells.Free description included many responses with “HIBIKI”. In comparison with negative responses like “insufficient HIBIKI” toward glass wind bells, positive responses like “pretty HIBIKI” are observed for metal wind bells. The sound of metal wind bells has a long decay time and presence of “interference beat,” and such characteristics seem to be contributing to the impression of “HIBIKI”. In the case of porcelain wind bells, answers are divided into “HIBIKI” and “not HIBIKI”. Acoustic analysis indicates shorter decay time and presence of “interference beat”, therefore, and gives the impression like “HIBIKI” more than glass wind bells that do not have “interference beat.”Keywords: Wind Bell, HIBIKI, Interference Beat, Sound Decay Time研究ノートHiroyoshi SHIOKAWA＊ and Miho TAKAO＊＊塩川博義＊，高尾美穂＊＊日本大学生産工学部研究報告A2024年 12 月 第 57 巻 第 ２ 号─ 1 ─ ＊日本大学生産工学部建築工学科教授＊＊株式会社鴻池組（元日本大学大学院）─風鈴の音に対する日本人の感性に関する研究─風鈴の音の「響き」と「うなり」について
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