Abstract: A weighing device includes: a weighing scale that measures a weight of a good; a communication interface that outputs goods purchase information including a purchase weight value based on a measured value by the weighing scale; and a central processing unit (CPU). In response to the CPU detecting that the measured value by the weighing scale has increased from zero to a positive value and then decreased from the positive value to zero, the communication interface outputs, as the purchase weight value, goods purchase information including the positive value.

Abstract: A weighing sales system includes: a plurality of weighing devices that weigh articles; and an information terminal. Each of the weighing devices includes: a weighing device processor that: detects a weight of the articles, and transmits the detected weight and identification information of each of the weighing devices, and the information terminal includes: a terminal processor that: receives the detected weight and the identification information, and acquires article information from a predetermined storage based on the identification information.