To easily assemble frame, etc., such as reinforced steel framed-concrete aggregate, prefabricating steel frame, scaffolding and filing shelf even a worker is an unskilled person.

A frame member is so formed that it has a roughly T-shaped section wherein the width of each right and left sides 12 and 12 is the same as the height of a vertical side 11, and a plurality of bolt holes 13... are so bored in the sides at specific intervals that they are set in the same positions in the longitudinal direction. A plurality of bolt holes 14... are so bored in the vertical side at specific intervals that they are positioned in middle parts of the adjacent bolt holes in the sides in the longitudinal direction. Vertical sides of two frame members, both right and left sides or the vertical and horizontal sides can be clamped with bolts.