Using a guidance system with a simple configuration, propulsive motion along a longitudinal direction and changing of the propulsion direction are easily performed with good precision and stability. There is provided a capsule-type medical apparatus 201 which is inserted into the body of a subject and is guided by an external magnetic field, the capsule-type medical apparatus 201 comprising: a substantially cylindrical capsule 202 a propulsion mechanism 207 for converting rotary motion about a longitudinal axis R of the capsule 202 into propulsive motion along the longitudinal axis R a magnet 205 accommodated inside the capsule 202 and disposed in such a manner that the magnetic-pole direction thereof can be switched between a direction along the longitudinal axis R and a direction intersecting the longitudinal axis R and a securing portion 212 for securing the magnet 205 to the capsule 202 in each of the switched states of the magnetic-pole direction.
