A capsule endoscope 10 that generates a resonance magnetic field according to the driving magnetic field is disposed in the detection space K, is formed in the detection space K, the position detection system 1 according to the present invention, the driving magnetic field in the detection space and the magnetic field generating coil D1 that occurs, the detection coil S1~S8 to detect the synthetic magnetic field and the driving magnetic field and the resonance magnetic field capsule endoscope 10 is generated in response to the driving magnetic field, synchronization and magnetic field detection in S1~S8 detection coil a current detecting unit 32 for detecting a driving current flowing through the magnetic field generating coil D1 in, and based on the detected value of the driving current detected by the current detector 32 and the detected value of the combined magnetic field sensed by S1~S8 detection coil Te, I provided with a position detection unit 50 which calculates the position and orientation of the capsule endoscope 10.本発明にかかる位置検出システム1は、検出空間内Kに配置され、検出空間K内に形成された駆動磁界に応じて共振磁界を発生するカプセル内視鏡10と、検出空間内に駆動磁界を発生する磁界発生コイルD1と、駆動磁界に応じてカプセル内視鏡10が発生する共振磁界と駆動磁界との合成磁界を検出する検出コイルS1~S8と、検出コイルS1~S8における磁界検出と同期して磁界発生コイルD1に流れる駆動電流を検出する電流検出部32と、検出コイルS1~S8によって検出された合成磁界の検出値と電流検出部32によって検出された駆動電流の検出値とに基づいて、カプセル内視鏡10の位置および方向を算出する位置検出部50を備える。
