A wet granulation apparatus (1, 101), comprising: a housing; a container (5, 105) supported on the housing, and including a first opening and a second opening, the container (5, 105) operable to contain granulation mediums to granulate a target material within a period of time from supply of the target material through the first opening to discharge of the target material through the second opening; a granulating rotor disposed in the container (5, 105) and defining a treat-ment gap in cooperation with an inner wall surface of the container (5, 105), the granulating rotor being in the form of a cylinder having an end wall and including a medium discharge opening (71 a) formed in a circumferential wall thereof for allowing granulation mediums having moved in the cylinder through the treatment gap to be discharged to the treatment gap; a rotor rotating mechanism (8, 108) for rotating the granulating rotor, characterized by further comprising: a container rotating mechanism (6, 106) for rotating the container (5, 105); a target material guiding section in the form of a cylinder in appearance and defining an annular separating gap in cooperation with an inner wall surface of the granulating rotor, the target material guiding section being rotatably disposed in the inside space of the granulating rotor coaxially with the granulating rotor, for guiding, to the second opening, the target material having been introduced in the granulating rotor through the treatment gap, wherein the container (5, 105) is rotatably supported on the housing, and the rotor rotating mechanism (8, 108) is for rotating the granulating rotor relatively to the container (5, 105). a housing; a container (5, 105) supported on the housing, and including a first opening and a second opening, the container (5, 105) operable to contain granulation mediums to granulate a target material within a period of time from supply of the target material through the first opening to discharge of the target material through the second opening; a granulating rotor disposed in the container (5, 105) and defining a treat-ment gap in cooperation with an inner wall surface of the container (5, 105), the granulating rotor being in the form of a cylinder having an end wall and including a medium discharge opening (71 a) formed in a circumferential wall thereof for allowing granulation mediums having moved in the cylinder through the treatment gap to be discharged to the treatment gap; a rotor rotating mechanism (8, 108) for rotating the granulating rotor, a container rotating mechanism (6, 106) for rotating the container (5, 105); a target material guiding section in the form of a cylinder in appearance and defining an annular separating gap in cooperation with an inner wall surface of the granulating rotor, the target material guiding section being rotatably disposed in the inside space of the granulating rotor coaxially with the granulating rotor, for guiding, to the second opening, the target material having been introduced in the granulating rotor through the treatment gap, wherein the container (5, 105) is rotatably supported on the housing, and the rotor rotating mechanism (8, 108) is for rotating the granulating rotor relatively to the container (5, 105).