Abstract: An MR imaging apparatus using NMR phenomenon includes a main magnet, a first, a second and a third gradient field coils, a RF coil, a gradient field controller connected to the first, second and third gradient field coils, a RF controller connected to the RF coil, a waveform generator, a carrier wave generator, an amplitude modulator, a RF controller connected to the RF coil, and a data processor. The waveform generator generates a modulating signal expressed by F(t)=A {cos (.omega.t)-cos (E.omega.t)}/t, where A is an amplitude coefficient, .epsilon. is a non-excitation band coefficient, and .omega. is a frequency of the modulating signal. The RF controller causes the RF coil, in each pulse sequence, to transmit a RF signal and to apply, to the RF signal, a modulated wave output from the amplitude modulator as an MTC pulse having a frequency component slightly offset from a resonance frequency of free water protons, and a resonance frequency component of free water protons.