An RF coil (10) for MRI apparatus is provided which comprises a dielectric unit (12), such as a bobbin, plurality of coil conductors (13, 13) formed on the outer peripheral surface of the dielectric unit (12) in a mutually adjacent relation to generate a magnetic field, and frame (14), such as a guard ring, provided on the inner surface of the dielectric unit (12) to define a bobbin portion (15) of the dielectric unit (12). An accommodation space (16) is provided inside the bobbin to located a living substance to be examined, allowing an RF wave to be transmitted and received to and from the subject (P) in the accommodation space. A plurality of openings (12a) are provided in the dielectric unit (12) per se at a location of the bobbin portion (15). By so doing, it is possible to reduce an induction loss in the bobbin portion (15) which would otherwise be damaging to the electrical function of the RF coil (10) and to obtain an RF coil of an improved Q-factor.
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