A register includes a retainer, and a fin assembly. The retainer has an outlet opening. The fin assembly includes a plurality of fin members. The fin members are disposed in the retainer in a manner neighboring one after another. One of the neighboring paired fin members has a first end. The other one of the neighboring paired fin members has a second end facing the first end when the fin members swing to the close position. The register further includes an air deflector disposed between the first end and the second end, whereby deflecting the blowing direction of air flowing out from the outlet opening of the retainer outward when the fin members swing to the close position.