An object of the invention is to provide a body-insertable apparatus system that enables to reliably stick a needle in a puncture target layer. In the invention, a capsule endoscope (10) includes a needle (16) that can be protruded or retracted with respect to a surface of a casing, and a permanent magnet (18). A magnetic field controller (8) causes a magnetic field generator to generate a magnetic field for changing an orientation of the permanent magnet (18) based on a magnetization direction of the permanent magnet (18) in the capsule endoscope (10), a position of the needle (16) in the capsule endoscope (10), and a distal end direction of the needle (16). Accordingly, the magnetic field controller (8) changes the orientation of the entire capsule endoscope (10) to enable the protruded needle (16) to puncture the puncture target layer. As a result, the needle (16) can be reliably stuck in the puncture target layer.
