PURPOSE: To improve the Z-directional spatial distribution of the produced magnetic field intensity of high-frequency magnetic field pulses and the sensitivity distribution in uniformity respectively by providing a short-circuiting means which consists of conductors having dielectric materials sandwiched so that one-terminal sides of a couple of conductor means are coupled.

CONSTITUTION: The high-frequency probe is constituted by providing a couple of symmetrical copper plates 1A, a short-circuit surface 5 which consists of plural strips of copper foil 6 having short strips of dielectric coil 7 made of polyethylene, etc., sandwiched and where one-terminal sides of the couple of copper plates 1A are coupled, and a capacitor 4 coupling electrode parts 1x of the copper plates 1A. Then, a LC series resonance circuit is formed of the copper plates 1A, short-circuit surface 5, and capacitor 4 to form a coil which produces a high-frequency magnetic field. Consequently, the edge effect of high-frequency magnetic field pulses generated with a high-frequency pulse current I is reduced by the short-circuit surface 5 and the intensity of a magnetic field H produced nearby the short-circuit surface 5 has small attenuation, so that the uniformity of the spatial distribution is improved. The pulses are applied in a Y direction and a nuclear magnetic resonance signal NMR generated in a sample in the probe is detected by the coil, thereby forming an image having a small brightness irregularity by a NMR image processor.