An image forming apparatus that is capable of reducing a jam and correcting misalignment of a sheet due to a buckling of the sheet certainly. A skew correction unit conveys a sheet while contacting one of side edges of the sheet with a reference member that is arranged in parallel to a conveyance direction in order to correct a skew of the sheet conveyed along a conveyance path. A misalignment correction unit moves the sheet that the skew has been corrected in a width direction perpendicular to the conveyance direction. A sheet position detection unit detects a position of the other of the side edges of the sheet that the skew has been corrected. A moving amount determination unit determines a moving amount by which the misalignment correction unit moves the sheet in the width direction.