An item storage apparatus includes a first storage to store items, a carrier to take an item from the first storage and convey the item, a first support supporting the carrier to be movable back and forth in a first horizontal direction, a second support supporting the first support to be movable back and forth in a second horizontal direction perpendicular to the first horizontal direction, a vertical moving mechanism supporting the second support to be movable back and forth in a vertical direction perpendicular to the first horizontal direction and the second horizontal direction, and a second storage to store the item. At least one of the first or second storage has a multi-tier structure in which a space for movement of the carrier is between tiers. The first support has a cantilever structure in which one end is secured to the second support and another end is free.