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