In a capsule endoscope 10, inside a housing 11, a plurality of connecting sections 27 of a circuit board 20 formed by arranging a plurality of board sections 21 to 26 to one another in a row via the connecting sections 27 are bent at 180 degrees and the plurality of board sections 21 to 26 are arranged such that principal planes of the respective board sections 21 to 26 are orthogonal to a center axis O of the housing 11. The capsule endoscope 10 includes a transducer section 22C, a first image pickup chip 22A connected to the transducer section 22C via two signal lines and configured to generate a clock signal and acquire first image data according to the generated clock signal, a second image pickup chip 25A configured to acquire second image data according to the clock signal transmitted by one signal line from the first image pickup chip 22A, and a transmitting section 23A configured to transmit the first image data and the second image data by radio.
