To provide an attaching construction permitting installation work and removal work easily for temporary long-sized pole members without taking too much work and time, and also permitting the moving and diversion quickly while avoiding the breakage of the long-sized pole members.

This comprises a concrete block 12 made of a heavy base portion 10 placed on a ground surface 14, a projected linkage portion 11 projecting upward from the heavy base portion 10, and a recessed linkage portion 15 formed at the lower end portion of an electric pole 13 as a temporary long-sized pole member. And the sectional shape of the projected linkage portion 11 of the concrete block 12 is the same as the section shape of the recessed linkage portion 15 of the electric pole 13, and the electric pole 13 is erected by fitting the recessed linkage portion 15 to the projected linkage portion 11, at the time of this fitting, a bolt hole 17 of the matching projected linkage portion 11 is aligned with the bolt opening of the recessed linkage portion 15 and they are tightened by using a fixing bolt 16.