A capsule endoscope includes, inside a capsule casing, an information acquiring section that acquires information on an inside of a body of a subject, a battery that supplies power, a detection section that, upon detection of introduction to the inside of the body of the subject, outputs a detection signal, a signal receiving section that receives a control signal from an outside and outputs an internal signal, and a control section that controls power supply from the battery to the information acquiring section according to the internal signal and the detection signal.
