A kneading rotor (4, 5) rotatably disposed in a casing of a batch-type kneading apparatus, the kneading rotor (4, 5) comprising: a rotor shaft; and kneading wings (13 to 18) configured to rotate integrally with the rotor shaft to apply a shearing force to a material to be kneaded by passing the material to be kneaded through a clearance between the kneading wings (13 to 18) and an inner surface of the casing, wherein the kneading wings (13 to 18) include: long wings (13 to 15) extending from a first end side of a rotor axial direction; and short wings (16 to 18) extending from a second end side of the rotor axial direction, each of the long wings (13 to 15) is disposed in a range longer than half of a length of a range, in the rotor axial direction, in which the kneading wings (13 to 18) are disposed, and each of the long wings (13 to 15) is twisted in a direction of flowing the material to be kneaded toward the second end side of the rotor axial direction when the rotor shaft rotates, each of the short wings (16 to 18) is disposed in a range shorter than half of the length of the range, in the rotor axial direction, in which the kneading wings (13 to 18) are disposed, and each of the short wings (16 to 18) is twisted in a direction of flowing the material to be kneaded toward the first end side of the rotor axial direction when the rotor shaft rotates, and a twist angle (θL) of each of the long wings (13 to 15) is between 38 degrees and 53 degrees inclusive, characterized in that each of the long wings (13 to 15) includes, between each of the long wings (13 to 15) and the inner surface of the casing, a wing top configured to form, along a wing longitudinal direction, a first tip clearance, and a second tip clearance narrower than the first tip clearance in width, and a central angle (θc) around a rotor axis defining a width of the wing top forming the second tip clearance is between 5 degrees and 10 degrees inclusive. a rotor shaft; and kneading wings (13 to 18) configured to rotate integrally with the rotor shaft to apply a shearing force to a material to be kneaded by passing the material to be kneaded through a clearance between the kneading wings (13 to 18) and an inner surface of the casing, wherein the kneading wings (13 to 18) include: long wings (13 to 15) extending from a first end side of a rotor axial direction; and short wings (16 to 18) extending from a second end side of the rotor axial direction, each of the long wings (13 to 15) is disposed in a range longer than half of a length of a range, in the rotor axial direction, in which the kneading wings (13 to 18) are disposed, and each of the long wings (13 to 15) is twisted in a direction of flowing the material to be kneaded toward the second end side of the rotor axial direction when the rotor shaft rotates, each of the short wings (16 to 18) is disposed in a range shorter than half of the length of the range, in the rotor axial direction, in which the kneading wings (13 to 18) are disposed, and each of the short wings (16 to 18) is twisted in a direction of flowing the material to be kneaded toward the first end side of the rotor axial direction when the rotor shaft rotates, and a twist angle (θL) of each of the long wings (13 to 15) is between 38 degrees and 53 degrees inclusive, characterized in that each of the long wings (13 to 15) includes, between each of the long wings (13 to 15) and the inner surface of the casing, a wing top configured to form, along a wing longitudinal direction, a first tip clearance, and a second tip clearance narrower than the first tip clearance in width, and a central angle (θc) around a rotor axis defining a width of the wing top forming the second tip clearance is between 5 degrees and 10 degrees inclusive. long wings (13 to 15) extending from a first end side of a rotor axial direction; and short wings (16 to 18) extending from a second end side of the rotor axial direction, each of the long wings (13 to 15) is disposed in a range longer than half of a length of a range, in the rotor axial direction, in which the kneading wings (13 to 18) are disposed, and each of the long wings (13 to 15) is twisted in a direction of flowing the material to be kneaded toward the second end side of the rotor axial direction when the rotor shaft rotates, each of the short wings (16 to 18) is disposed in a range shorter than half of the length of the range, in the rotor axial direction, in which the kneading wings (13 to 18) are disposed, and each of the short wings (16 to 18) is twisted in a direction of flowing the material to be kneaded toward the first end side of the rotor axial direction when the rotor shaft rotates, and a twist angle (θL) of each of the long wings (13 to 15) is between 38 degrees and 53 degrees inclusive, each of the long wings (13 to 15) includes, between each of the long wings (13 to 15) and the inner surface of the casing, a wing top configured to form, along a wing longitudinal direction, a first tip clearance, and a second tip clearance narrower than the first tip clearance in width, and a central angle (θc) around a rotor axis defining a width of the wing top forming the second tip clearance is between 5 degrees and 10 degrees inclusive.