A drive device comprising: a motor (M; M1) including: a rotational shaft; a housing supporting the rotational shaft for rotation and having a cylindrical shape, the housing having a leg portion extending radially outwardly from an inner peripheral surface of the housing; a bearing supporting the rotational shaft for rotation and press-fitted onto the inner peripheral surface of the housing; and a thrust cover supporting an end of the rotational shaft and fixed onto the inner peripheral surface of the housing; wherein an outer edge of the thrust cover includes: a second recessed portion recessed radially inwardly from the thrust cover; and a second projection portion projecting radially outwardly from the thrust cover, characterised in that: the drive device further comprises a board including an opening, an inner edge of the opening including: a first recessed portion recessed radially outwardly from the opening, and a first projection portion projecting radially inwardly from the opening; and the leg portion of the housing is fixed to the board so as to surround the opening therein; wherein: at least the first and second projection portions (101a, 110b) partially overlap each other when viewed in an axial direction of the rotational shaft, a first gap (GHa) is defined between the second recessed portion and the inner peripheral surface of the housing in a radial direction of the rotational shaft, a second gap is defined between the first and second projection portions (101a, 110b) in the axial direction of the rotational shaft, and the thrust cover is fixed onto the inner peripheral surface of the housing by an adhesive which is filled in the first and second gaps (GHa, GA), and in a space surrounded by the thrust cover, the housing and the board so as to cover the opening. a motor (M; M1) including: a rotational shaft; a housing supporting the rotational shaft for rotation and having a cylindrical shape, the housing having a leg portion extending radially outwardly from an inner peripheral surface of the housing; a bearing supporting the rotational shaft for rotation and press-fitted onto the inner peripheral surface of the housing; and a thrust cover supporting an end of the rotational shaft and fixed onto the inner peripheral surface of the housing; wherein an outer edge of the thrust cover includes: a second recessed portion recessed radially inwardly from the thrust cover; and a second projection portion projecting radially outwardly from the thrust cover, a rotational shaft; a housing supporting the rotational shaft for rotation and having a cylindrical shape, the housing having a leg portion extending radially outwardly from an inner peripheral surface of the housing; a bearing supporting the rotational shaft for rotation and press-fitted onto the inner peripheral surface of the housing; and a thrust cover supporting an end of the rotational shaft and fixed onto the inner peripheral surface of the housing; wherein an outer edge of the thrust cover includes: a second recessed portion recessed radially inwardly from the thrust cover; and a second projection portion projecting radially outwardly from the thrust cover, a second recessed portion recessed radially inwardly from the thrust cover; and a second projection portion projecting radially outwardly from the thrust cover, characterised in that: the drive device further comprises a board including an opening, an inner edge of the opening including: a first recessed portion recessed radially outwardly from the opening, and a first projection portion projecting radially inwardly from the opening; and the leg portion of the housing is fixed to the board so as to surround the opening therein; the drive device further comprises a board including an opening, an inner edge of the opening including: a first recessed portion recessed radially outwardly from the opening, and a first projection portion projecting radially inwardly from the opening; and a first recessed portion recessed radially outwardly from the opening, and a first projection portion projecting radially inwardly from the opening; and the leg portion of the housing is fixed to the board so as to surround the opening therein; wherein: at least the first and second projection portions (101a, 110b) partially overlap each other when viewed in an axial direction of the rotational shaft, a first gap (GHa) is defined between the second recessed portion and the inner peripheral surface of the housing in a radial direction of the rotational shaft, a second gap is defined between the first and second projection portions (101a, 110b) in the axial direction of the rotational shaft, and the thrust cover is fixed onto the inner peripheral surface of the housing by an adhesive which is filled in the first and second gaps (GHa, GA), and in a space surrounded by the thrust cover, the housing and the board so as to cover the opening. at least the first and second projection portions (101a, 110b) partially overlap each other when viewed in an axial direction of the rotational shaft, a first gap (GHa) is defined between the second recessed portion and the inner peripheral surface of the housing in a radial direction of the rotational shaft, a second gap is defined between the first and second projection portions (101a, 110b) in the axial direction of the rotational shaft, and the thrust cover is fixed onto the inner peripheral surface of the housing by an adhesive which is filled in the first and second gaps (GHa, GA), and in a space surrounded by the thrust cover, the housing and the board so as to cover the opening.