A compact and economical transcranial magnetic stimulation system has a magnetic field generator for generating a magnetic field to be used for providing magnetic stimulation to the head of patient. The generator has a magnetic coil for generating a variable magnetic field and a holder for holding the magnetic coil. The holder has positioning portions for positioning the holder against respective markings on the head of patient. The coil is placed into a suitable posture against certain position by aligning the positioning portions with the markings on the head of patient.
