A sheet conveying device that conveys a sheet includes a sheet conveying path, a conveying mechanism, and a guiding plate. The sheet conveying path is set to include a nonlinear portion. The conveying mechanism is arranged in the sheet conveying path to convey a sheet. The guiding plate is arranged in the nonlinear portion of the sheet conveying path and has a guiding plane along which the sheet is guided. The guiding plate includes a thinned portion in an area of the guiding plane against which a leading end of the sheet is conveyed along the sheet conveying path collides so that the thinned portion suppresses high frequency components of an impulsive sound produced by the collision.