PROBLEM TO BE SOLVED: To improve the balance of selection burden. SOLUTION: Three wind split bodies (30, 31, 32) of an upper stage, a middle stage, and a lower stage for branching the blowing direction of the sorted wind from Kara (24) are provided, and between the wind split bodies, from below. Sorting in which a first sorting air duct (33), a second sorting air duct (34), a third sorting air duct (35), and a fourth sorting air duct (36) are formed in order, and the air is blown from the first sorting air duct. The wind flows through the upper side of the No. 1 transfer spiral (25a) arranged on the rear side of the Karako (24) and the No. 1 return rack (22) provided at the lower part of the rocking sorting rack (15) to select the wind. Then, the sorting air blown from the second sorting air passage flows toward the latter half side of the Glensieeve (21) and the chaff sheave (19) provided in the front-rear direction intermediate portion of the swing sorting shelf to select the wind. The sorting air blown from the sorting air passage blows through the middle side of the chaff sheave for wind selection, and the sorting air sent from the fourth sorting air passage is a transfer rack (in front of the swing sorting rack (15) ( 17) It acts on the starting end side of the chaff sheave along the lower surface of the tip to select the wind. [Selection diagram] Fig. 3【課題】選別負担のバランス化向上を図る。【解決手段】唐箕（２４）からの選別風の送風方向を分岐させる上段、中段、下段の３個の風割体（３０，３１，３２）を設け、各風割体の間に、下から順に第１選別風路（３３）、第２選別風路（３４）、第３選別風路（３５）、第４選別風路（３６）を形成し、第１選別風路から送風される選別風は、唐箕（２４）の後側に配置された１番移送螺旋（２５ａ）の上側及び揺動選別棚（１５）の下部に備えた１番戻し棚（２２）上を経て流れて風選し、第２選別風路から送風される選別風は、揺動選別棚の前後方向中間部に備えたグレンシーブ（２１）及びチャフシーブ（１９）の後半側に向かって流れて風選し、第３選別風路から送風される選別風は、チャフシーブの中間側を吹き抜けて風選し、第４選別風路から送風される選別風は揺動選別棚（１５）の前部に備えた移送棚（１７）先端の下面に沿ってチャフシーブの始端側に作用して風選する。【選択図】図３
