fig3 is a block diagram of a configuration of the capsule endoscope 3 as shown in fig3 the capsule endoscope 3 has a light emitting diode led 19 that irradiates an imaging area when the inside of the subject 1 is photographed an led driving circuit 20 that controls a driving state of the led 19 a charge coupled device ccd 21 that images a reflected light image from the area irradiated by the led 19 and a signal processing circuit 22 that processes an image signal output from the ccd 21 into imaging information having a desired format further the capsule endoscope 3 has a ccd driving circuit 26 that controls a driving state of the ccd 21 an rf transmitter 23 that modulates the image data imaged by the ccd 21 by the signal processing circuit 22 so as to generate an rf signal a transmitting antenna 24 that wirelessly transmits the rf signal output from the rf transmitter 23 and a system control circuit 32 that controls operations of the led driving circuit 20 the ccd driving circuit 26 and the rf transmitter 23 the ccd 21 the signal processing circuit 22 and the ccd driving circuit 26 are collectively called as an imaging circuit 40 when these mechanisms are provided while the capsule endoscope 3 is introduced into the subject 1 image information about portions to be examined irradiated by the led 19 is acquired by the ccd 21 the signal processing circuit 22 executes the signal process on the acquired image information and after the rf transmitter 23 converts the image information into an rf signal it transmits the rf signal to the outside via the transmitting antenna 24 the capsule endoscope 3 has a receiving antenna 25 that receives a radio.