REDUCTION GEAR AND BRAKE DEVICE

To provide a reduction gear which can make components securely engaged with each other in manufacturing.SOLUTION: A reduction gear according to this embodiment comprises: a housing formed with a hole which is opened in a first direction, and having an internal peripheral face, a wall part hanging out of the internal peripheral face, and a first end part of the internal peripheral face in a first peripheral direction; a gear assembly accommodated in the hole, and having an external peripheral face, a plurality of gears, and a second end part in a second peripheral direction opposite to the first peripheral direction; and a rotation-stop member having a base interposed between the first end part and the second end part, and limiting the relative movement of the housing and the gear assembly, and a second engagement part arranged at an end part of the base in the first direction, at least partially facing a first engagement part, and limiting the movement of the base in the first direction with respect to the housing and the gear assembly.SELECTED DRAWING: Figure 1 【課題】一例として、製造時における部品同士の係合を確実にすることを可能とする減速装置を得る。【解決手段】実施形態に係る減速装置は、第１の方向に開放された孔、が設けられ、内周面と、前記内周面から張り出した壁部と、前記内周面の第１の周方向の第１の端部と、を有する、ハウジングと、前記孔に収容され、外周面と、複数のギヤと、前記第１の周方向の反対の第２の周方向の第２の端部と、を有する、ギヤアセンブリと、前記第１の端部と前記第２の端部との間に介在して前記ハウジングと前記ギヤアセンブリとが相対的に移動することを制限するベースと、前記第１の方向における前記ベースの端部に設けられるとともに第１の係合部に少なくとも部分的に面して前記ベースが前記ハウジング及び前記ギヤアセンブリに対して前記第１の方向に移動することを制限する第２の係合部と、を有する回り止め部材と、を備える。【選択図】図１