The watching system 1 radiates and receives microwaves to detect biological information of the subject, a radio wave detection unit 21, an optical detection unit 34 that can image the downstream side of the microwave radiation direction, and microwave emission The azimuth changing mechanism 22 capable of changing the azimuth, the azimuth detecting unit 28 capable of detecting the microwave radiating azimuth, and the pixel position in the image area 5a captured by the optical detecting unit 34 and the microwave radiating azimuth are associated with each other. And an orientation map 8. The watching system 1 converts the pixel position corresponding to the designated position in the image area 5 a to the microwave radiation direction based on the direction map 8, and the previous microwave radiation detected by the direction detection unit 28 by the direction change mechanism 22. The direction is changed to the microwave radiation direction corresponding to the indicated position.見守りシステム１はマイクロ波を放射及び受信して被検者の生体情報を検出するための電波検出部２１と、マイクロ波の放射方位の下流側が撮像可能な光学検出部３４と、マイクロ波の放射方位が変更可能な方位変更機構２２と、マイクロ波の放射方位が検出可能な方位検出部２８と、光学検出部３４が撮像する画像領域５ａ内の画素位置とマイクロ波の放射方位とを対応付けた方位マップ８と、を備える。見守りシステム１は方位マップ８に基づいて画像領域５ａ内の指示位置に対応する画素位置をマイクロ波の放射方位に変換し、方位変更機構２２によって方位検出部２８が検出した従前のマイクロ波の放射方位を前記指示位置に対応するマイクロ波の放射方位に変更する。
