A capsule endoscope 20 includes a plurality of function executing sections 31 and 32 which acquire information inside a body of a subject, a battery 26 which supplies power to the plurality of function executing sections 31 and 32, a switching section 23 having a plurality of switches MS 1 and MS2 which independently control power supply from the battery 26 to the respective function executing sections 31 and 32, a magnetic field sensing section 21 which receives a control signal from outside the subject, and a power control section 22 which controls the switching section 23 according to the number of times the control signal is received by the magnetic field sensing section 21.
