PROBLEM TO BE SOLVED: To provide a biological information measurement apparatus which can comfortably be worn for long by facilitating the release of sweat and moisture from a portion where a belt and the skin adhere to each other, to the outside.SOLUTION: A biological information measurement apparatus (measuring instrument 1) comprises a belt 20 for fixing a case 10 to a living body. The belt 20 has recessed grooves 28 and 29 in its side facing the living body, the grooves 28 and 29 being 1020-1140 μm deep.SELECTED DRAWING: Figure 3【課題】汗や水分をバンドと皮膚との密着部分から外部に逃げ易くし、長時間快適に装着できる生体情報測定機器を提供する。【解決手段】生体情報測定機器（測定機器１）は、ケース部１０を生体に固定するバンド２０を備え、バンド２０には、生体に面する側に凹形状の溝部２８，２９が設けられ、溝部２８，２９の深さは、１０２０μｍ以上１１４０μｍ以下である。【選択図】図３
