A transcranial magnetic stimulator according to the present invention includes fixing means for detachably fixing a magnetic field generating means and contains a fixture of a head which covers a head of an examinee to be fixed engaged with a shape of the head that is inherent to an examinee； and characterized in that: a relative position of the magnetic field generating means with respect to the head of the examinee is held constant so that the highest point of an intensity of an electric current to be induced by a magnetic field to be generated by the magnetic field generating means is constantly arranged on a target spot of a diameter not more than 10 mm, which depends on each of the examinees and is located within a cranium, by fixing the magnetic field generating means to the fixing means and a direction of a magnetic field to be generated by the magnetic field generating means and a direction of the target spot are made into a fixed relation.
