A motor unit includes a bearing rotatably holding a shaft, and a housing accommodating a rotor, a stator, and the bearing. The housing has an opening, a cover closing the opening and fixed to the housing, and an annular member that has an annular shape when viewed from the axial direction and is provided independently from the bearing. The cover includes an accommodation portion accommodating the annular member, one or more ribs disposed radially outward of the accommodation portion when viewed from the axial direction, and one or more fixing points fixed to the housing. The one or more ribs extend outward from the accommodation portion. When viewed from the axial direction, for at least one of the ribs, the fixing point is formed on an extension line extending outward from the rib in a direction in which the rib extends.