A plate material processing device (301) is provided with a pressurizing unit (305) for pressurizing a plate material (W), and a receiving unit (307) for receiving the plate material pressurized by the pressurizing unit, and comprises: an end face pressing upper mold (309) that receives pressurization force from the pressurizing unit; an end face pressing lower mold (311) that is provided on the receiving unit side to face the end face pressing upper mold, an end face (319) of the plate material being inserted between the end face pressing upper mold and the end face pressing lower mold; an end face pressing unit (313) that presses the end face of the plate material by relatively moving the end face pressing upper mold to the end face pressing lower mold side; and an end face pressing width adjustment unit (315) that sets the pressing width of the end face of the plate material.
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