PROBLEM TO BE SOLVED: To provide a speed reducing device including a motor and a speed reducing mechanism.;SOLUTION: A speed reducing device 1 includes a motor 2 and a speed reducing mechanism 3. The motor includes: a stator part 20; a shaft part 200; and a rotator part 21. The rotator part includes a first eccentric ring 211 and a second eccentric ring 212. The speed reducing mechanism includes first, second and third roller assemblies 32, 33, 34 and first and second cycloid disc sets. These roller assemblies include first rollers 321, second rollers 331, and third rollers 341. The first cycloid disc set is mounted around the first eccentric ring, and includes first teeth and second teeth. The second cycloid disc set is mounted around the second eccentric ring, and includes third teeth and fourth teeth. The first teeth are in contact with the first rollers. The third teeth are in contact with the second rollers. The second teeth and the fourth teeth are in contact with the third rollers 341.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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