A living body observation system of the present invention includes an in vivo observation apparatus including: an in vivo information acquisition section a power supply section a magnetic field detection section for detecting a magnetic field from outside and a power supply control section for controlling a supply state of driving power supplied to the in vivo information acquisition section, based on an electric signal, and a magnetic field generation section which generates the magnetic field, the magnetic field generation section including: a transmission antenna which includes a transmission coil which generates an alternating magnetic field for controlling activation and deactivation of the in vivo observation apparatus and a ferromagnetic material which is arranged in an outer periphery of the transmission coil and decreases a leakage of the alternating magnetic field in surroundings, and transmits the alternating magnetic field a driver for driving the transmission antenna and a power supply for supplying power to the driver.
