PROBLEM TO BE SOLVED: To provide a measurement device which can measure biological information stably even when attached/detached repeatedly.SOLUTION: A measurement device 1 comprises a case part 10 having a detection part that detects biological information, a band part 20 that fixes the case part 10 to a living body, and a buckle part 30 that is annularly connected to the band part 20 and can be adjusted in length.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】着脱を繰り返しても、生体情報を安定的に測定可能な測定機器を提供すること。【解決手段】測定機器1は、生体情報を検出する検出部を有するケース部10と、ケース部10を生体に固定するバンド部20と、バンド部20と環状に接続するとともに、長さを調整可能なバックル部30とを備えている。【選択図】図1