A probe for NMR comprises a coil for irradiating an RF magnetic field and a coil for receiving an NMR signal, wherein the coil for irradiating the RF magnetic field comprises one wire or one sheet of foil, and the coil for receiving the NMR signal is formed of part of the coil for irradiating the RF magnetic field. A lead wire pair is drawn out from a portion on the way of a winding of the coil that comprises one wire or one sheet of foil, and a coil portion between the lead wire pair is assumed to be a second coil. The lead wires are each provided with a selection circuit which is switchable between a cut-off circuit and a passing circuit, and the selection circuit is switched where necessary.