MAGNETIC RESONANCE OBSERVING DEVICE

PROBLEM TO BE SOLVED: To provide a magnetic resonance observing device for improving receiving efficiency of an MR signal. SOLUTION: An MR antenna 10 is composed of an inserting part body 12 composed of a flexible capillary having an introducing titrough-hole 11, a freely inflatable contractible balloon 13 being arranged in a tip part of this inserting part body 12 and having openings in both end parts and a tube body 4 having a through-hole for communicating with a space formed of this balloon 13 and an outer peripheral surface of the inserting part body 12. An antenna coil 15 forming a conductive loop-shaped opening as shown by a broken line is embedded in the balloon 13. Both end parts of the antenna coil 25 are connected to an electric cable 16 embedded in the inserting part body 12. A surgical tape 17 is wound on both end part outer peripheral surfaces of the balloon 13 to be integrally fixed to the inserting part body 12. The balloon 13 is inflated and contracted by sending and sucking air via the tube body 14.