An object of the present invention is to easily start to operate a body-insertable apparatus which is introduced into a subject and executes a predetermined function. In a capsule endoscope (3) of the invention, a magnetic switch (14) is arranged in a tubular capsule casing (16) of the capsule endoscope (3) in a direction substantially perpendicular to a longitudinal axis t direction of the capsule casing (16). A movable electrode of the magnetic switch (14) is brought into contact with a fixed electrode of the magnetic switch by a magnetic induction action by a magnetic field generated by a magnet (6), which is applied to the magnetic switch (14) from the outside of the capsule endoscope (3) in a direction substantially parallel to the longitudinal axis t direction of the capsule casing 16. As a result, electric power can be supplied from a power source unit to a function executing unit.
