Hand rest device and vehicle occupant support device

A hand rest device, comprising:

• a hand rest that is disposed at a front side of a seat of a vehicle, the hand rest being disposed at a usage position for supporting a hand of a vehicle occupant having a physique corresponding to JM50 seated at the seat, the hand rest being attached to the front seat via a pair of attachment bodies attached to stays of a headrest of the front seat, the hand rest being turnably supported by a turning shaft provided at a rear portion of the attachment bodies;
• and
• an adjustment mechanism provided between the attachment bodies and the turning shaft, and configured to adjust a height of the usage position of the hand rest to a height in a height range from greater than or equal to 320 mm to less than or equal to 500 mm from a hip point of the vehicle occupant,
• wherein the adjustment mechanism comprises:
• a casing fixed to the turning shaft;
• a central shaft provided inside the casing;
• a gearwheel fixed to the central shaft;
• a restraining protrusion integrally provided on the casing;
• and
• a restraining slot formed at an outer peripheral portion of the gearwheel,
• wherein a turning direction of the casing and the turning shaft is restrained by the restraining protrusion abutting on one end surface or another end surface of the restraining slot.