To provide an arranging structure of a horizontal member for earth retaining excellent in workability, efficiency, and safety of installing work.

Vertical directional wales 10 and 12 and horizontal directional wales 11 and 13 are joined in the shape of forming a right angle on the same plane via an L-shaped joining member 30 having two joining hands 31 and 31. A vertical directional strut 20 and a horizontal directional strut 21 are joined in the shape of crossing on the same plane via a cross-shaped joining member 32 having four joining hands 33, 33, 33 and 33 projecting on the same plane.