A bill validation device includes a main body having a bill validation part for validating a bill inserted through a bill insertion opening and a bill conveyance mechanism for conveying a bill, and a bill holder attached to the main body for holding bills determined as valid by the bill validation part. The main body has a data recording medium insertion opening into which a card-shaped data recording medium may be inserted and includes a data recording medium processor for at least one of writing data to and reading data from the data recording medium.