A support device for a bearing that rotatably supports a shaft extending in a first direction includes a case that houses the bearing, and a bracket to which the case is fixed. When the case is fixed to the bracket, a first abutting portion of a case main body is in a state abutting against a first bracket abutting portion of a bracket main body in the first direction, and a second case abutting portion of the case main body is in a state abutting against a second bracket abutting portion of the bracket main body in a second direction that forms a right angle with the first direction. There is a region where the case and the bracket are separated between the abutting locations of these abutting portions.