An antenna unit includes a receiving antenna which receives in-vivo information of a subject transmitted from a capsule medical apparatus, a wireless-signal generator which receives the in-vivo information of the subject received by the receiving antenna and generates a wireless signal including the received in-vivo information, a power supply unit which supplies power for the wireless signal generator, an outer covering on which the receiving antenna, the wireless-signal generator, the transmitting antenna, and the power supply unit are mounted. The power supply unit is flexible and can be transformed easily according to transformation of the outer covering.
