A wireless sensor module has a sensor that measures a measuring object to generate measured data, a wireless communication section that wirelessly transmits the measured data to an external device and receives a radio signal from the external device, a control section that controls the sensor and the wireless communication section, and an electric power storage device that serves as an electric power supply. The control section secures an idle period of time in a series of operations for processing the measured data so that the series of operations are not carried out consecutively. The series of operations includes an operation in which the sensor generates the measured data, and an operation in which the wireless communication section wirelessly transmits the measured data to the external device.