According to one embodiment, a receipt data processing device includes an obtaining section, a data generating section, and an output section. The obtaining section is configured to obtain customer code of a customer who purchased an item. The data generating section configured to generate receipt data including information about the purchased item, and include the customer code in the receipt data when the customer code is obtained. The output section is configured to output the receipt data to a certain destination based on whether or not the receipt data includes the customer code.