A test mode enable circuit for putting a device in a test mode includes a serial-to-parallel shift register reset by a reset signal, a decoder circuit, and a gate circuit. A magnetic body is disposed so as to guide, from one magnetic pole to the other magnetic pole, a magnetic field which is generated from the magnet of the capsule endoscope that is accommodated between and positioned by a first hold portion of an outer case and a second hold portion of an inner case which position the capsule endoscope. Tag information for the data objects is determined. If the contents are different from one another, the comparator indicates that a fault has occurred.