Armrest for vehicle seat

An armrest for a vehicle seat, the armrest being attached to the vehicle seat in a pivotable manner between an in-use position and a stored position, the in-use position being where the armrest is substantially horizontal and the stored position being where the armrest is at an opposite end of a range of motion of the armrest from the in-use position, the armrest comprising:

• a cup holder portion;
• a first blocking portion disposed toward a pivot center line of the armrest relative to the cup holder portion in a wall-like manner, extending parallel to the pivot center line, and projecting upwardly when the armrest is in the stored position;
• a second blocking portion extending in a vicinity of a root of the first blocking portion in a wall-like manner parallel to extending directions of the first blocking portion so as to be interposed between the cup holder portion and the pivot center line, the second blocking portion comprising at least one first through hole that penetrates the second blocking portion for communication from the cup holder portion toward the pivot center line.