An automatic vending machine includes: a belt conveyor constituting a part of a column configured to store a product, the belt conveyor being able to convey the stored product along the column, and a controller configured to control an operation of the belt conveyor. The controller acquires an amount of movement of a belt of the belt conveyor moving to convey the product. The controller calculates the number of products stored in the column, based on the acquired amount of movement of the belt.