A magnetic resonance imaging apparatus enabling highly precise spectrum measurement even when resonance frequency changes during MRS or MRSI measurement is provided. When a pulse sequence for suppressing water signals, and an MRS pulse sequence or MRSI pulse sequence are sequentially executed to carry out MRS or MRSI measurement using repetitive measurement for signal integration or repetitive measurement for phase encoding, signal Sig0 from water is measured with the pulse sequence for suppressing water signals in every repetitive measurement. When the resonance frequency of water deviates from an excitation band region, nuclear magnetization included in water molecules is not excited, so that water signal strength decreases, and therefore change of static magnetic field intensity can be detected by monitoring change of the signal Sig0. When the water signal strength decreases below a predetermined value, it is determined that the resonance frequency has shifted, preliminary measurement for detecting water resonance frequency is performed, and various frequencies are corrected during the repetitive measurement.