The gate member and the cylindrical segment does not close to the distance that there is a risk of metal contact, a wider adjustment range of the kneading degree. Kneading degree adjusting apparatus is cylindrical segments are installed in the same time equipped with a kneading screw for kneading by sending the material to the downstream kneading treatment equipment that is formed at a predetermined position, the kneading degree adjusting device for adjusting the degree of kneading of the material, the cylindrical have a facing surface that faces the outer peripheral surface of the segment, the gate member to the opposing face is changed to the area of ​​the flow path of the material to be formed between the relevant go to spaced close to the outer peripheral surface of the cylindrical segment opposite surface and the outer surface of the cylindrical segment said opposing surface and provided, and the outer peripheral surface has a concave-convex portion is provided is that the flow path to form a curved shape.