PURPOSE: To examine the wide range of a piping and cope with various kinds of piping, by providing an axial driving part, circumferential driving part, connecting body connecting both driving parts, a ring which is attached with a contact and is held on both driving parts, etc.

CONSTITUTION: A trackless examining device is constituted with a driving part 30 in the axial direction which is distributed in the circumferential direction of the outside face of a piping 10, a driving part 20 in the circumferential direction, a connecting body 60 which is provided for attaching these driving parts to the outside face of the piping 10, a ring 40 which incorporates an ultrasonic probe 50 and is moved along the outside circumference of the piping 10, holding shafts 25 and 35 which rolls which are provided for holding this ring 40, and a shaft 26 with a pinion 27 which gives the rotation from the circumferential driving part 20 to the ring 40. By this constitution, a wide range of the piping is examined, and the examining device is applied to pipings having various kinds of outside diameter dimensions.