A ledger document processing device including a display section which displays a live view image captured by an imaging section while waiting for a ledger document to be captured, and a processor which actualizes functions including judging whether a pixel-count size of an area corresponding to the ledger document in an image to be captured and stored in response to an imaging instruction is equal to or larger than a reference pixel-count size while waiting for the ledger document to be captured, notifying a user of a judgment result, and storing in a storage section the image captured by the imaging section in response to the imaging instruction.