PROBLEM TO BE SOLVED: To provide an arm part compression device and a sphygmomanometer capable of measuring a blood pressure value at stable accuracy without requiring troublesome work to the general user.SOLUTION: An arm part compression device 1 for compressing an arm part of a person to be measured and arresting the blood flow is configured as follows. The arm part compression device includes: a first pressing part 13 and a second pressing part 23 having prescribed rigidity fluid bags 30 that are provided on a surface where the first pressing part 13 faces the second pressing part 23 and a surface where the second pressing part 23 faces the first pressing part 13 and, when a fluid flows, inflate to press the arm part and an energizing member that energizes the first pressing part 13 and the second pressing part 23 so as to clamp the arm part.COPYRIGHT: (C)2015,JPO&INPIT【課題】一般のユーザに煩雑な作業を要求せずに、安定した精度で血圧値の測定を行うことを可能とする腕部位圧迫装置、及び血圧測定装置を提供すること。【解決手段】被測定者の腕部位を圧迫して阻血する腕部位圧迫装置1を次のように構成する。すなわち、所定の剛性を有する第1押圧部13及び第2押圧部23と、前記第1押圧部13が前記第2押圧部23に対向する面、及び前記第2押圧部23が前記第1押圧部13に対向する面に設けられ、流体が流入すると膨張して前記腕部位を押圧する流体袋30と、前記腕部位を挟持するように前記第1押圧部13及び前記第2押圧部23を付勢する付勢部材と、を備えさせる。【選択図】図1