Can be stably maintained in the OFF state or ON state can be performed reliably and off the various functions of the body-insertable apparatus and the can. Switch control for controlling on and off of the observation member when the magnetic sensor 3 for detecting a magnetic field with a directional observation member for observing said subject inside by imaging by illuminating the object 1, the magnetic sensor 3 detects the magnetic field parts, and a capsule endoscope 2 having a transmission member for transmitting to the first external subject information including the observation image, the magnetic field generating unit 4 for irradiating the object 1 in the field temporary, irradiation of the magnetic field arm driving unit 5 for changing the direction, based on the reception result of the viewer 6, and a magnetic field generating apparatus having a control unit C for controlling the driving of the arm drive unit 5 and the irradiation control of the magnetic field by the magnetic field generating unit 4.被検体内導入装置内の各種機能のオンオフを確実に行うことができ、かつオン状態あるいはオフ状態を安定して維持すること。指向性をもって磁場を検出する磁気センサ3、被検体1内を照明し撮像して該被検体内部を観察する観察部材、磁気センサ3が磁場を検出した場合に観察部材のオンオフを制御するスイッチ制御部、および前記観察画像を含む情報を被検体1外部に送信する送信部材を有したカプセル型内視鏡2と、一時的な磁場を被検体1内に照射する磁場発生部4、磁場の照射方向を変更するアーム駆動部5、ビュア6の受信結果をもとに、磁場発生部4による磁場の照射制御およびアーム駆動部5の駆動制御する制御部Cを有した磁場発生装置とを備える。
