Deflector structure for automobile

A deflector structure for an automobile (1) according to one embodiment of the present invention is provided with: a liner extending section (9b) that covers an underside opening situated anterior to a wheel house (8) in a vehicle front part (2); and a deflector (20) mounted to the liner extending section (9b). The deflector structure is characterized in that: the deflector (20) is configured by integrally forming a deflector base part (21) which is mounted to the liner extending section (9b) by means of bolts and resin clips, and a substantially planar deflector body (22) which has a certain thickness and exhibits flexibility in the anteroposterior direction of the vehicle, and which is disposed so as to extend toward the lower part of the vehicle from the rear end of the deflector base part (21); and, on a rear face of the deflector body (22), a plurality of rear face ribs (23) which each extend in the vertical direction of the vehicle, and which each have a top end that abuts the undersurface of the liner extending section (9b) are provided at a predetermined interval in the vehicle width direction.