The sphygmomanometer prevents wrapping state of a fluid bag for a measurement from being varied by controlling a wrapping mechanism with the addition and subtraction of the pressure applied to the fluid bag for the measurement after the fluid bag for the measurement is wrapped around a measurement part. Furthermore, measurement accuracy is improved by keeping compliance of the fluid bag for the measurement constant.本發明之血壓測定裝置係在測定用流體袋對測定部位執行捲繞之後,藉由與測定用流體袋之加減壓並行地執行捲繞機構的控制,以防止測定用流體袋之捲繞狀態產生變化。或者是藉由將測定用流體袋之順從性保持成一定而可使測定精度提升。
