BIOLOGICAL INFORMATION ACQUISITION SYSTEM

PROBLEM TO BE SOLVED: To provide a biological information acquisition system in which a power source of a biological information acquisition device can be reliably switched on/off.SOLUTION: The biological information acquisition system includes the biological information acquisition device provided with a biological information acquisition part, and a magnetic field generation part. The biological information acquisition device includes: a power source part capable of supplying the drive power of the biological information acquisition part; a first switching control part for controlling the on/off state of a first switch part connected to the power source part, on the basis of the output state of magnetic field detection signals corresponding to the detection result of a magnetic field generated from the magnetic field generation part; a second switching control part for controlling the on/off state of a second switch part connected between the first switch part and the biological information acquisition part, on the basis of the output state of the magnetic field detection signals; and a third switching control part for executing the control of switching the second switch part from on to off, when it is detected for the first time that a fixed period has elapsed since the biological information acquisition device is arranged inside a subject.