A press brake that performs bending with respect to a workpiece by a die and a punch, the press brake comprising: a die that can support a rear surface of the workpiece; a punch that is arranged so as to be opposed to the die and can move in an upper-lower direction relative to the die to press a front surface of the workpiece; a crowning mechanism that can change a crowning amount that is an amount of upward projection of a middle portion of the die relative to both end portions of the die in a die longitudinal direction; a bending amount measuring device that measures a middle bending amount and end bending amounts, the middle bending amount being a bending amount of a width direction middle portion of the workpiece, the end bending amounts being bending amounts of width direction end portions of the workpiece, wherein said width direction of the workpiece coincides with the die longitudinal direction; and a control device , wherein: the control device acquires from the bending amount measuring device the middle bending amount and the end bending amounts of the workpiece that has been subjected to the bending by the die and the punch; characterized in that the control device corrects the crowning amount in accordance with a difference between a shortage of the middle bending amount from a target bending amount and a shortage of each end bending amount from the target bending amount and drives the crowning mechanism . a die that can support a rear surface of the workpiece; a punch that is arranged so as to be opposed to the die and can move in an upper-lower direction relative to the die to press a front surface of the workpiece; a crowning mechanism that can change a crowning amount that is an amount of upward projection of a middle portion of the die relative to both end portions of the die in a die longitudinal direction; a bending amount measuring device that measures a middle bending amount and end bending amounts, the middle bending amount being a bending amount of a width direction middle portion of the workpiece, the end bending amounts being bending amounts of width direction end portions of the workpiece, wherein said width direction of the workpiece coincides with the die longitudinal direction; and a control device , wherein: the control device acquires from the bending amount measuring device the middle bending amount and the end bending amounts of the workpiece that has been subjected to the bending by the die and the punch; characterized in that the control device corrects the crowning amount in accordance with a difference between a shortage of the middle bending amount from a target bending amount and a shortage of each end bending amount from the target bending amount and drives the crowning mechanism . the control device acquires from the bending amount measuring device the middle bending amount and the end bending amounts of the workpiece that has been subjected to the bending by the die and the punch; characterized in that the control device corrects the crowning amount in accordance with a difference between a shortage of the middle bending amount from a target bending amount and a shortage of each end bending amount from the target bending amount and drives the crowning mechanism . <EOS>