This capsule endoscope has a sensor, analysis unit, determining unit, image pickup unit, wireless transmission unit, and processing unit. The sensor detects a physical quantity at a first rate, and generates first data indicating the physical quantity thus detected. The wireless transmission unit transmits a wireless frame at a second rate. In first processing, the processing unit generates second data by performing operations on the basis of the plurality of first data, and generates the wireless frame including the second data. In second processing, the processing unit generates the wireless frame including the plurality of first data.