A sheet conveyance device comprising: a loading section on which a sheet is loaded; a paper feed section configured to allow the sheet loaded on the loading section to transfer in a conveyance direction to supply the sheet to a sheet conveyance path; a separation section arranged on an opposite side of the sheet conveyance path from the paper feed section and configured to independently supply the sheet loaded on the loading section to the sheet conveyance path on a sheet-by-sheet basis; a first conveyance roller pair arranged downstream of the paper feed section in the conveyance direction and configured to convey a sheet downstream in the conveyance direction; a second conveyance roller pair arranged downstream of the first conveyance roller pair in the conveyance direction and configured to convey the sheet supplied to the sheet conveyance path in the conveyance direction; a multi feed sensor arranged at a first point between the paper feed section and the first conveyance roller pair and configured to vary a level of its output signal according to the number of overlapped sheets supplied to the sheet conveyance path; and a sheet conveyance controller configured to control sheet conveyance operation and perform multi feed determination as to whether or not multi feed occurs on the basis of a level of the output signal from the multi feed sensor, wherein when a front end of a sheet arrives at the second conveyance roller pair, the sheet conveyance controller starts performing the multi feed determination, when occurrence of multi feed is determined, the sheet conveyance controller suspends each driving of the first conveyance roller pair and the second conveyance roller pair, characterized in that the sheet conveyance controller suspends driving of the paper feed section upon the front end of the sheet arriving at the second conveyance roller pair, the sheet conveyance controller performs the multi feed determination by determining whether or not the output signal from the multi feed sensor is at a level indicating occurrence of multi feed continuously during a threshold time, which is set equal to or shorter than a time taken from arrival of a front end of a sheet at the second conveyance roller pair to passage of a rear end of the sheet over the first point, and the sheet conveyance controller determines that multi feed occurs when the output signal of the multi feed sensor is at the level indicating occurrence of multi feed continuously during the threshold time. a loading section on which a sheet is loaded; a paper feed section configured to allow the sheet loaded on the loading section to transfer in a conveyance direction to supply the sheet to a sheet conveyance path; a separation section arranged on an opposite side of the sheet conveyance path from the paper feed section and configured to independently supply the sheet loaded on the loading section to the sheet conveyance path on a sheet-by-sheet basis; a first conveyance roller pair arranged downstream of the paper feed section in the conveyance direction and configured to convey a sheet downstream in the conveyance direction; a second conveyance roller pair arranged downstream of the first conveyance roller pair in the conveyance direction and configured to convey the sheet supplied to the sheet conveyance path in the conveyance direction; a multi feed sensor arranged at a first point between the paper feed section and the first conveyance roller pair and configured to vary a level of its output signal according to the number of overlapped sheets supplied to the sheet conveyance path; and a sheet conveyance controller configured to control sheet conveyance operation and perform multi feed determination as to whether or not multi feed occurs on the basis of a level of the output signal from the multi feed sensor, wherein when a front end of a sheet arrives at the second conveyance roller pair, the sheet conveyance controller starts performing the multi feed determination, when occurrence of multi feed is determined, the sheet conveyance controller suspends each driving of the first conveyance roller pair and the second conveyance roller pair, characterized in that the sheet conveyance controller suspends driving of the paper feed section upon the front end of the sheet arriving at the second conveyance roller pair, the sheet conveyance controller performs the multi feed determination by determining whether or not the output signal from the multi feed sensor is at a level indicating occurrence of multi feed continuously during a threshold time, which is set equal to or shorter than a time taken from arrival of a front end of a sheet at the second conveyance roller pair to passage of a rear end of the sheet over the first point, and the sheet conveyance controller determines that multi feed occurs when the output signal of the multi feed sensor is at the level indicating occurrence of multi feed continuously during the threshold time.