Provided is a trading card in which a trading card package and content of the trading card package are linked and the content can be specified, and an illegal act can be found. A manufacturing method for a trading card package includes a step of grouping trading cards 4 on which rareness degree RM information is printed and a step of packaging the grouped trading cars 4. Trading card IDs 2 are imparted to the trading cards 4. In the grouping step, the trading card IDs 2 are registered in a database DB. A package ID 3 is imparted to a package 1. The package ID 3 is enclosed in the package 1 or provided on the package 1. The package ID 3 of the package 1 including the trading cards 4 and the trading card IDs 2 and the rareness degrees RM included in the package 1 are associated.