An object of the present invention is to provide a body-insertable apparatus which can instantly obtain a high power while maintaining a small size with a small power source capacity. The body-insertable apparatus, according to the invention, having a plurality of function executing units each of which executes a predetermined function and a power source (20) which supplies an electric power to each of the function executing units, includes: an electric power storing unit (23) which is connected to the power source (20) and temporarily stores a redundancy of the electric power supplied from the power source (20) and an electric power discharging switch (24) which supplies the electric power stored during the temporal period by the electric power storing unit (23) to a high-power function executing unit as a function executing unit like an LED group (11) which, among the function executing units, operates intermittently and temporarily consumes a large electric quantity compared to the other function executing units. The high-power function executing unit consumes the electric power supplied from the electric power storing unit (23) together with the electric power directly supplied from the power source (20).
