A support device for a bearing, the bearing being configured to rotatably support a shaft that extends in a first direction, the support device comprising: a case configured to house the bearing, the case including a case main body and a case fixing portion (20, 22), the case fixing portion (20, 22) being provided on an outside of the case main body; and a bracket fixed to a base body, the bracket including a bracket main body and a bracket fixing portion (42, 43), the bracket main body being configured to house at least a portion of the case main body; characterised in that the case fixing portion (20, 22) is fixed to the bracket fixing portion (42, 43) by an engaging member, wherein a first case abutting portion and at least one second case abutting portion (28, 30) are provided on an outer surface of the case main body, a first bracket abutting portion and at least one second bracket abutting portion (50, 52) are provided on a surface of the bracket main body, the first case abutting portion abuts against the first bracket abutting portion so as to define a position of the case with respect to the bracket in the first direction; the at least one second case abutting portion (28, 30) abuts against the respective at least one second bracket abutting portion (50, 52) so as to define a position of the case with respect to the bracket in a second direction, the second direction is a direction that forms a right angle with the first direction, the case fixing portion (20, 22) abuts against the bracket fixing portion (42, 43) so as to define a position of the case with respect to the bracket in a third direction, the third direction is a direction that forms a right angle with both the first direction and the second direction, and the case and the bracket are separated at a region between a first abutting location of the first case abutting portion and the first bracket abutting portion, and a second abutting location of the second case abutting portion (28, 30) and the second bracket abutting portion (50, 52), in a circumferential direction of the bearing housed in the case. a case configured to house the bearing, the case including a case main body and a case fixing portion (20, 22), the case fixing portion (20, 22) being provided on an outside of the case main body; and a bracket fixed to a base body, the bracket including a bracket main body and a bracket fixing portion (42, 43), the bracket main body being configured to house at least a portion of the case main body; characterised in that the case fixing portion (20, 22) is fixed to the bracket fixing portion (42, 43) by an engaging member, wherein a first case abutting portion and at least one second case abutting portion (28, 30) are provided on an outer surface of the case main body, a first bracket abutting portion and at least one second bracket abutting portion (50, 52) are provided on a surface of the bracket main body, the first case abutting portion abuts against the first bracket abutting portion so as to define a position of the case with respect to the bracket in the first direction; the at least one second case abutting portion (28, 30) abuts against the respective at least one second bracket abutting portion (50, 52) so as to define a position of the case with respect to the bracket in a second direction, the second direction is a direction that forms a right angle with the first direction, the case fixing portion (20, 22) abuts against the bracket fixing portion (42, 43) so as to define a position of the case with respect to the bracket in a third direction, the third direction is a direction that forms a right angle with both the first direction and the second direction, and the case and the bracket are separated at a region between a first abutting location of the first case abutting portion and the first bracket abutting portion, and a second abutting location of the second case abutting portion (28, 30) and the second bracket abutting portion (50, 52), in a circumferential direction of the bearing housed in the case.