< Topic >It is installed in the position where the cuffs the wrist is correct, the wrist type hemadynamometer which measures blood pressure value accurately or by preventing the body motion of the subject in blood pressure measurement, is offered.SolutionsIt winds the wrist type hemadynamometer, in the wrist of the subject and it is provided in the cuffs 150 which is turned and cuffs 150, when cuffs 150 has wound in the wrist of the subject and is turned, strain sensor it has with 31 in order to detect the deformation of the cuffs 150 which it occurs with the radial styloid projection and ulnar styloid projection of the wrist surface and strain sensor 32. With the measurable quantity of the said strain sensor, you attach and whether or not installation position of cuffs 150 is normal, facilities CPU judges. When installation is normal, when being normal entering blood pressure measurement process, in order to halt the process from now on, it constitutes.< Choice figure >Drawing 4【課題】カフが手首の正しい位置に装着される、もしくは血圧測定中の被験者の体動を防ぐことによって、血圧値を正確に測定する手首式血圧計を提供する。【解決手段】手首式血圧計は、被験者の手首に巻き回されるカフ150と、カフ150に設けられ、カフ150が被験者の手首に巻き回された状態で、手首表面の橈骨茎状突起および尺骨茎状突起によって生じるカフ150の歪みを検出するための歪センサ31および歪センサ32とを備える。該歪センサの測定値により、カフ150の装着位置が正常であるか否かを付設のCPUが判断する。装着が正常な時には血圧測定プロセスに入り、正常でない時は、以後のプロセスを停止する様に構成する。【選択図】図4