A product storage method is carried out by a product storage system comprising an intermediate storage yard, a product moving means capable of holding a product, of moving vertically, laterally and longitudinally and of placing the product at any place in the intermediate storage yard, a first conveying means for conveying products to the intermediate storage yard, a second conveying means for conveying the products out of the intermediate storage yard, and a control means for controlling the product moving means, the first conveying means and the second conveying means. The control means identifies the type of a product conveyed to the intermediate storage yard by the first conveying means and decides whether or not the product is to be sent to a terminal position, the tire moving means transfers the tire be sent to the terminal position to the second conveying means, the second conveying means carries the same product to the terminal position, and the product moving means carries products other than those to be sent to the terminal position to any places in the intermediate storage yard to store the products in groups of types at the places.