To provide a blood flow sound sensor which can be easily mounted on a subject and can accurately collect blood flow sound.SOLUTION: A blood flow sound sensor 1 which is mounted on an upper limb of a subject to collect a blood flow sound comprises: plural plate-like sound collection sensors 3 arranged at predetermined intervals in a direction in which the upper limb extends； and a belt-like part 2 wound around the upper limb and fixing the sound collecting sensors at a predetermined place of the upper limb. The sound collecting sensors 3 extend in one direction, and a dimension along the one direction is longer than a dimension in a direction crossing the one direction.SELECTED DRAWING: Figure 1【課題】被検者への装着が容易で、正確な血流音の収集が可能な、血流音センサを提供する。【解決手段】被検者の上肢に装着して血流音を収集する血流音センサ１であって、前記上肢が延びる方向に所定の間隔で配置される複数の板状の集音センサ３と、前記上肢に巻きつけられて前記集音センサを前記上肢の所定の箇所に固定する帯状部２を備え、前記集音センサ３は、一方の方向に向かって延びており、前記一方の方向の寸法は、前記一方の方向と交わる方向の寸法よりも長いことを特徴とする血流音センサ１。【選択図】図１
