The sheet conveying apparatus includes first to third pairs of skew conveying rollers conveying a sheet, a reference portion, in which the reference portion corrects a skew feeding of the sheet by abutting a side edge of the sheet conveyed by the first to third pairs of skew conveying rollers against a reference surface placed in parallel with the sheet conveying direction, and a guide groove provided on the reference portion, which guides the side edge of the sheet skew-conveyed by the first to third pairs of skew conveying rollers to the reference surface, wherein a vertical width of an opening portion of the guide groove in an upstream area of the reference portion is wider than that of the guide groove in a downstream area of the reference portion, in the sheet conveying direction.