< Topic >It measures & records the active mass of the person and the number of steps it relates to the body data gathering device health care, it uses the installation to the especially wrist and the like easily and it offers the body data gathering device which improves the selfishness.SolutionsCase means the case center section possess the band section 20,21 of the pair which extending facilities is done on left and right both sides of 60 which internalizes body motion detection means and case center section 60 in the body data gathering device which consists of with the case means which enclose body motion detection means and the body motion detection means which detect body motion, either among the band sections on the one hand as for 20 as it has magnet 10 near the Tip, other band section 21 has magnetic substance 30 near the Tip, features that magnetism it makes wear both.< Choice figure >Drawing 2【課題】人の活動量や歩数を計測・記録し健康管理を行う身体情報収集装置に係り、特に手首等への装着を容易にして使い勝手を向上させた身体情報収集装置を提供する。【解決手段】身体運動を検出する身体運動検出手段と身体運動検出手段を収納するケース手段とからなる身体情報収集装置において、ケース手段は身体運動検出手段を内蔵したケース中央部60およびケース中央部60の左右両側に延設した一対のバンド部20,21を具備し、バンド部のうちのいずれか一方20はその先端部付近にマグネット10を備えると共に、他方のバンド部21はその先端部付近に磁性体30を備え、両者を磁着させたことを特徴とする。【選択図】図2