An arm rest for a vehicle seat includes a console part and an arm support mounted at the console part so as to be swivelable about a swivel axis between a use position and a rest position. Latching teeth fixedly arranged at the console part or at the arm support engage a latching engagement member mounted at the arm support or at the console part so as to be shiftable. An inertia member mounted so as to be shiftable between at least one release position and at least one blocked position. The inertia member, in the blocked position, prevents unlatching of the latching engagement member from a latched status, wherein inertia member is shifted from the release position into the blocked position upon an acceleration of the arm rest due to the inertia of the inertia member.