To provide a disc fitting type link mechanism which follows up movement of bellows type joint in the case that two pipes are connected to each other across the bellows type pipe joint in which it is unnecessary to form links of highly strong material since flexibility is obtained through a structure of the link, possible to reduce a cost, and replustion is not generated since the links have a soft structure.

A male link has an arm 1 whose one end is a circle part 2 having a diameter larger than an arm width of the link, and the other end of a rectangular form. A circle hole is formed on a center portion of a rectangular female link 4 such that the circle part of the male link is fitted therein and slid therewith. The male link is connected to the female link across bellows type pipe joint while fitting of the circle part. Rectangular parts of the links are welded to the inside of two pipes to be connected. The circle part 2 is covered with a cover plate 5 and installed through welding or a bolt.