PURPOSE:To execute an ultrasonic flaw detection from the inside of a pipe for a long time, by providing an uneven groove between a probe driving part and a probe rotating part, and charging a sealing medium into said groove. CONSTITUTION:An uneven groove 16 is provided between a probe rotating part 4 and a probe driving part 3, and a sealing medium 17 which has higher viscosity than that of an ultrasonic contact medium 7 and is not fused is charged between said groove and a seal ring 12. By a micromotor 9 contained in the driving part 3, a shaft 10 is rotated and the probe rotating part is rotated, by which the whole face flaw detection from the inside of a pipe can be executed, and even when the shaft 10 is being rotated by the seal ring 12, the uneven groove 16 and the sealing medium 17, the contact medium 7 for propagating an ultrasonic wave 5 isolated from the inside of the driving part 3, and a continuous flaw detection extending over a long time can be executed.
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