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 (103, 104) and be transported according to rotation of the first roll and the second roll (103, 104), 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 (109, 110); 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 (103, 104) and be transported according to rotation of the first roll and the second roll (103, 104), 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 (109, 110); 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 (109, 110); 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.