Direction of the magnetic field in target position P can be modified simply in all directions, magnetic field supply system 10 is offered. Magnetic field supply system 10, principal plane 28a and 28b through the air gap G on the one hand, in order to oppose parallel, includes magnetic field occurrence section 16of a the pair which is arranged on the same axis and 16b. Magnetic field occurrence section 16a and 16b respectively turn to arrow A direction by rotary drive section 20a and 20b. Direction of the magnetic field in target position P magnetic field occurrence section 16a and 16b by turning with the same angle to the same direction of the respective arrow A direction, is modified with respect to X-Z plane surface. In addition, in order to modify the position relationship between pole of magnetic field occurrence section 16a and pole of magnetic field occurrence section 16b, the inclination for the X-Z plane surface of direction of the magnetic field in target position P at least either magnetic field occurrence section 16a or 16b by turning one side to arrow A direction, is modified.目標位置Pにおける磁界の向きを簡単に全方向に変更できる、磁界発生装置10を提供する。磁界発生装置10は、一方主面28a,28bが空隙Gを介して平行に対向するように同軸上に配置される一対の磁界発生部16a,16bを含む。磁界発生部16a,16bはそれぞれ、回転駆動部20a,20bによって矢印A方向に回転される。磁界発生部16a,16bをそれぞれ矢印A方向の同方向に同角度で回転させることによって、目標位置Pにおける磁界の向きがX-Z平面上で変更される。また、磁界発生部16aの磁極と磁界発生部16bの磁極との位置関係を変更するように磁界発生部16a,16bの少なくともいずれか一方を矢印A方向に回転させることによって、目標位置Pにおける磁界の向きのX-Z平面に対する傾きが変更される。
