To utilize a parallel four-joint link, obtain suitable maneuverability, also prevent a constitution from being complicated, and reduce a cost of manufacture.

A device comprises a parallel four-joint link 10 parallelly arranging the fellow opposed links mounted by a bearing so as to form a parallelogram by four links 14, 16, 18, 20, cylinder device 30 swiveling the other links 16, 18, 20 with one link 14 of the parallel four-joint link 10 serving as the reference in both directions narrowing a space of the fellow opposed links from a condition rectangularly supporting the parallel four-joint link 10, and a shock absorbing cylinder device 40 arranged between the opposed links 18, 20 to generate elastic force in a direction spreading a space of the fellow opposed links.