A support device for a bearing , the bearing being configured to rotatably support a shaft that extends in a first direction (D1), the support device comprising: a case configured to house the bearing , the case including a case main body and a case fixing portion , the case fixing portion 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 , the bracket main body being configured to house at least a portion of the case main body ; characterised in that the case fixing portion is fixed to the bracket fixing portion by an engaging member, wherein a first case abutting portion and at least one second case abutting portion are provided on an outer surface of the case main body , a first bracket abutting portion and at least one second bracket abutting portion 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 (D1); the at least one second case abutting portion abuts against the respective at least one second bracket abutting portion so as to define a position of the case with respect to the bracket in a second direction (D2), the second direction (D2) is a direction that forms a right angle with the first direction (D1), the case fixing portion abuts against the bracket fixing portion so as to define a position of the case with respect to the bracket in a third direction (D3), the third direction (D3) is a direction that forms a right angle with both the first direction (D1) and the second direction (D2), 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 and the second bracket abutting portion , 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 , the case fixing portion 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 , the bracket main body being configured to house at least a portion of the case main body ; characterised in that the case fixing portion is fixed to the bracket fixing portion by an engaging member, wherein a first case abutting portion and at least one second case abutting portion are provided on an outer surface of the case main body , a first bracket abutting portion and at least one second bracket abutting portion 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 (D1); the at least one second case abutting portion abuts against the respective at least one second bracket abutting portion so as to define a position of the case with respect to the bracket in a second direction (D2), the second direction (D2) is a direction that forms a right angle with the first direction (D1), the case fixing portion abuts against the bracket fixing portion so as to define a position of the case with respect to the bracket in a third direction (D3), the third direction (D3) is a direction that forms a right angle with both the first direction (D1) and the second direction (D2), 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 and the second bracket abutting portion , in a circumferential direction of the bearing housed in the case . <EOS>