To provide a strut for sectional furniture with which good appearance and strong structure can be compatible.

Concerning a shaft body, a continuos cavity 11 is formed at the central part of cross section along with axial direction, continuous holes 12 and 12 are formed outside the left and right sides of continuous cavity 11 along with axial direction, and an opening groove 13 is formed on the front face of continuous cavity 11 along with axial line. In this case, a plurality of pairs of ribs for forming a plurality of plate-shaped chambers 16, 17 and 18 orthogonal to a plate-shaped space composed of the opening groove and the inner walls of continuous cavity facing this groove are arranged inside the continuous cavity 11, the strut can be continuously molded at once while using materials such as aluminium, and extremely strong structure can be provided.