A sheet conveying device includes: a housing; a sheet supply tray; and a dust proof cover including a first cover and a second cover. The sheet supply tray is supported to the housing and pivotally movable between a closed position and an open position. The first cover is supported to the housing and pivotally movable between a first position in proximity to the sheet supply tray and a second position away from the sheet supply tray. The second cover is connected to the first cover and pivotally movable about a second pivot axis between a third position in proximity to the sheet supply tray and a fourth position away from the sheet supply tray. The second cover has a center of gravity positioned closer to the housing than the second pivot axis is to the housing in a state where the sheet supply tray is in the closed position.