In a nuclear magnetic resonance spectrometer, the shape of a detection
coil is changed from a conventional cage type to a solenoid type of
higher sensitivity. Accordingly, differing from the conventional
superconductive magnet of multilayer air core solenoids, a
superconductive magnet is right and left divided to split magnets for
generating 11 T, preferably, 14.1 T in the horizontal direction, and the
magnetic field uniformity is set to 0.001 ppm or less and the temporal
stability is set to 0.001 ppm or less.
