Sheet supplying device supplying sheets one by one from a stacked bundle of sheets, comprising a sheet supplying tray which is configured to stack a bundle of sheets, an air blowing system which blows air against the bundle of sheets stacked on the sheet supplying tray, and a vacuum conveyance section which is configured to vacuum an uppermost sheet of the bundle of sheets stacked on the sheet supplying tray and convey the sheets one by one in the sheet conveyance direction, the air blowing system comprises: a first air blowing section which is arranged to blow air against a side of the bundle of sheets stacked on the sheet supplying tray, a second air blowing section which is arranged to blow air from a position downstream of the bundle of sheets in sheet conveyance direction onto the leading section of the sheets, a shielding member (shutter 45) which is arranged to shield against air blown by the first air blowing section, a vacuum detection sensor which is arranged to detect that a sheet is vacuumed by the vacuum conveyance section, and characterized by a sheet feed sensor which is provided at a position downstream of the sheet supplying tray in sheet conveyance direction and arranged to detect a passage of the sheet, a control section which is configured to control the shielding member either to open or to close so that air generated by the first air blowing section is blown to the bundle of sheets or not, wherein, when the vacuum detection sensor detects that a sheet is vacuumed by the vacuum conveyance section and the sheet feed sensor doesn't detect the sheet, the control section is configured to control the shielding member so that air starts to be not blown from the first air blowing section against the bundle of sheets stacked on the sheet supplying tray, and, when the vacuum detection sensor detects that the sheet is vacuumed by the vacuum conveyance section and the sheet feed sensor detects the sheet, the control section is configured to control the shielding member so that air starts to be blown from the first air blowing section against the bundle of sheets. a sheet supplying tray which is configured to stack a bundle of sheets, an air blowing system which blows air against the bundle of sheets stacked on the sheet supplying tray, and a vacuum conveyance section which is configured to vacuum an uppermost sheet of the bundle of sheets stacked on the sheet supplying tray and convey the sheets one by one in the sheet conveyance direction, the air blowing system comprises: a first air blowing section which is arranged to blow air against a side of the bundle of sheets stacked on the sheet supplying tray, a second air blowing section which is arranged to blow air from a position downstream of the bundle of sheets in sheet conveyance direction onto the leading section of the sheets, a shielding member (shutter 45) which is arranged to shield against air blown by the first air blowing section, a vacuum detection sensor which is arranged to detect that a sheet is vacuumed by the vacuum conveyance section, and characterized by a sheet feed sensor which is provided at a position downstream of the sheet supplying tray in sheet conveyance direction and arranged to detect a passage of the sheet, a control section which is configured to control the shielding member either to open or to close so that air generated by the first air blowing section is blown to the bundle of sheets or not, wherein, when the vacuum detection sensor detects that a sheet is vacuumed by the vacuum conveyance section and the sheet feed sensor doesn't detect the sheet, the control section is configured to control the shielding member so that air starts to be not blown from the first air blowing section against the bundle of sheets stacked on the sheet supplying tray, and, when the vacuum detection sensor detects that the sheet is vacuumed by the vacuum conveyance section and the sheet feed sensor detects the sheet, the control section is configured to control the shielding member so that air starts to be blown from the first air blowing section against the bundle of sheets. a first air blowing section which is arranged to blow air against a side of the bundle of sheets stacked on the sheet supplying tray, a second air blowing section which is arranged to blow air from a position downstream of the bundle of sheets in sheet conveyance direction onto the leading section of the sheets, a shielding member (shutter 45) which is arranged to shield against air blown by the first air blowing section, a vacuum detection sensor which is arranged to detect that a sheet is vacuumed by the vacuum conveyance section, a sheet feed sensor which is provided at a position downstream of the sheet supplying tray in sheet conveyance direction and arranged to detect a passage of the sheet, a control section which is configured to control the shielding member either to open or to close so that air generated by the first air blowing section is blown to the bundle of sheets or not, wherein, when the vacuum detection sensor detects that a sheet is vacuumed by the vacuum conveyance section and the sheet feed sensor doesn't detect the sheet, the control section is configured to control the shielding member so that air starts to be not blown from the first air blowing section against the bundle of sheets stacked on the sheet supplying tray, and, when the vacuum detection sensor detects that the sheet is vacuumed by the vacuum conveyance section and the sheet feed sensor detects the sheet, the control section is configured to control the shielding member so that air starts to be blown from the first air blowing section against the bundle of sheets.