PROBLEM TO BE SOLVED: To appropriately set a battery low voltage as a lower limit value for a power supply voltage, in a sphygmomanometer for measuring a blood pressure by driving a pump that supplies fluid to a cuff for blood pressure measurement by a drive voltage of a pulsating current or an alternating current.SOLUTION: A sphygmomanometer includes: a pump drive circuit 320 which generates a drive voltage of a pulsating current or an alternating current using a power supply voltage supplied from a DC power source 53 and which drives a pump 32 using the drive voltage a storage part 51 for storing relationship between the drive voltage and a ripple voltage generated in the power supply voltage and a drive voltage detection part 62 for detecting the drive voltage output by the pump drive circuit 320. On the basis of the relationship between the drive voltage and the ripple voltage generated in the power supply voltage, that is stored in the storage part 51, a battery low voltage setting part 100 varies and sets a battery low voltage according to the drive voltage detected by the drive voltage detection part 62.COPYRIGHT: (C)2014,JPO&INPIT【課題】血圧測定用カフへ流体を供給するポンプを脈流または交流の駆動電圧で駆動して、血圧測定を行う血圧計において、電源電圧のための下限値としてのバッテリロー電圧を適切に設定すること。【解決手段】 直流電源53から供給される電源電圧を用いて脈流または交流の駆動電圧を作成し、この駆動電圧でポンプ32を駆動するポンプ駆動回路320を備える。駆動電圧と電源電圧に生ずるリップル電圧との間の関係を記憶する記憶部51を備える。ポンプ駆動回路320が出力する駆動電圧を検出する駆動電圧検出部62を備える。記憶部51に記憶された駆動電圧と電源電圧に生ずるリップル電圧との間の関係に基づいて、駆動電圧検出部62が検出する駆動電圧に応じて、バッテリロー電圧設定部100がバッテリロー電圧を可変して設定する。【選択図】図5
