An armrest for a vehicle seat can inhibit liquid droplets formed due to condensation from entering inside of the armrest when cup holders are tilted. The armrest comprises a cup holder portion, a wall-like first blocking portion, and a wall-like second blocking portion. The first blocking portion is provided toward a pivot center line relative to the cup holder portion, extends parallel to the pivot center line, and projects upwardly when the armrest is in the stored position. The second blocking portion extends in a vicinity of a root of the first blocking portion parallel to extending directions of the first blocking portion to be interposed between the cup holder portion and the pivot center line. The second blocking portion comprises at least one first through hole that penetrates the second blocking portion for communication from the cup holder portion toward the pivot center line.