Amusement device comprising: • a central shaft having a substantially vertical axis, said central shaft comprising a base structure; • a plurality of arms (3a, 3b, 3c, 3d), coupled to said central shaft, each of said arms (3a - 3d) being rotatable around a relevant arm axis, provided with one or more vehicles having seats for users of said amusement device, preferably arranged at both the ends (31, 32) of said arms (3a - 3d); • a gear system for rotating said plurality of arms (3a - 3d), the gear system comprising: - a gear motor coupled to a first gear, to rotate said first gear; - a plurality of second gears (72a, 72b, 72c, 72d), one for each arm (3a, 3b, 3c, 3d) of said plurality of arm, coupled to said first gear so that rotation of the first gear drives in rotation said second gears (72a - 72d), the rotation of said second gears (72a - 72d) causing rotation of each arm (3a - 3d) around the relevant arm axis; wherein the gear system is configured so that the angular speed of said arms (3a - 3d) is substantially identical for all the arms; wherein said first gear is directly meshing with said second gears (72a - 72d), or it is coupled to said second gears (72a - 72d) via one or more secondary gears, wherein said central shaft comprises one or more movable portions (2b, 2c), that are movable with respect to said base structure, said arms (3a, 3b, 3c, 3d) being coupled to said movable portions (2b, 2c), and wherein said gear motor, said first gear and said second gears (72a - 72d) are mounted on one of said movable portions (2b, 2c) of said shaft. • a central shaft having a substantially vertical axis, said central shaft comprising a base structure; • a plurality of arms (3a, 3b, 3c, 3d), coupled to said central shaft, each of said arms (3a - 3d) being rotatable around a relevant arm axis, provided with one or more vehicles having seats for users of said amusement device, preferably arranged at both the ends (31, 32) of said arms (3a - 3d); • a gear system for rotating said plurality of arms (3a - 3d), the gear system comprising: - a gear motor coupled to a first gear, to rotate said first gear; - a plurality of second gears (72a, 72b, 72c, 72d), one for each arm (3a, 3b, 3c, 3d) of said plurality of arm, coupled to said first gear so that rotation of the first gear drives in rotation said second gears (72a - 72d), the rotation of said second gears (72a - 72d) causing rotation of each arm (3a - 3d) around the relevant arm axis; - a gear motor coupled to a first gear, to rotate said first gear; - a plurality of second gears (72a, 72b, 72c, 72d), one for each arm (3a, 3b, 3c, 3d) of said plurality of arm, coupled to said first gear so that rotation of the first gear drives in rotation said second gears (72a - 72d), the rotation of said second gears (72a - 72d) causing rotation of each arm (3a - 3d) around the relevant arm axis; wherein the gear system is configured so that the angular speed of said arms (3a - 3d) is substantially identical for all the arms; wherein said first gear is directly meshing with said second gears (72a - 72d), or it is coupled to said second gears (72a - 72d) via one or more secondary gears, wherein said central shaft comprises one or more movable portions (2b, 2c), that are movable with respect to said base structure, said arms (3a, 3b, 3c, 3d) being coupled to said movable portions (2b, 2c), and wherein said gear motor, said first gear and said second gears (72a - 72d) are mounted on one of said movable portions (2b, 2c) of said shaft.