To provide a technology for enabling a customer to perform a predetermined operation related to a transaction without using customer authentication information.SOLUTION: A transaction device includes: an operation unit capable of receiving an input operation related to a face-to-face transaction; an imaging unit that allows imaging of an operator of the operation unit; and an invalidation unit that invalidates a predetermined operation in the operation unit while a predetermined image is displayed in the imaging unit.SELECTED DRAWING: Figure 8
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