A plate material feeding device comprising: a housing ; a first roll housed in the housing ; a second roll housed in the housing ; a first roll support member that supports the first roll; and a second roll support member that supports the second roll, the plate material feeding device enabling a plate material to be clamped by the first roll and the second roll and be transported according to rotation of the first roll and the second roll , characterized in that : the plate material feeding device includes a slider that is movable in a horizontal direction along one of the first roll support member and the second roll support member ; a hole is provided in one of the one roll support member and the slider and a rod is provided in another of the one roll support member and the slider ; at least a part of the rod and the hole slidably engaging with each other enables the one roll support member to move in a vertical direction when the slider moves in the horizontal direction; and the hole is a hole including an inclined surface inclined relative to the horizontal direction, and when the slider moves in the horizontal direction, the at least a part of the rod sliding on the inclined surface enables the one roll support member to move in the vertical direction. a housing ; a first roll housed in the housing ; a second roll housed in the housing ; a first roll support member that supports the first roll; and a second roll support member that supports the second roll, the plate material feeding device enabling a plate material to be clamped by the first roll and the second roll and be transported according to rotation of the first roll and the second roll , characterized in that : the plate material feeding device includes a slider that is movable in a horizontal direction along one of the first roll support member and the second roll support member ; a hole is provided in one of the one roll support member and the slider and a rod is provided in another of the one roll support member and the slider ; at least a part of the rod and the hole slidably engaging with each other enables the one roll support member to move in a vertical direction when the slider moves in the horizontal direction; and the hole is a hole including an inclined surface inclined relative to the horizontal direction, and when the slider moves in the horizontal direction, the at least a part of the rod sliding on the inclined surface enables the one roll support member to move in the vertical direction. the plate material feeding device includes a slider that is movable in a horizontal direction along one of the first roll support member and the second roll support member ; a hole is provided in one of the one roll support member and the slider and a rod is provided in another of the one roll support member and the slider ; at least a part of the rod and the hole slidably engaging with each other enables the one roll support member to move in a vertical direction when the slider moves in the horizontal direction; and the hole is a hole including an inclined surface inclined relative to the horizontal direction, and when the slider moves in the horizontal direction, the at least a part of the rod sliding on the inclined surface enables the one roll support member to move in the vertical direction. <EOS>