A method for producing a leaf spring having a leaf portion and an eye portion formed at the leaf portion including: forming a gap between a leading end of the eye and a facing surface facing the leading end, and shot peening an inner surface of the eye via a reflection member, wherein, at a cross section perpendicular to an axial direction of the eye portion, the leading end of the eye faces the facing surface so a straight line does not cross the leading end of the eye, the straight line connecting an intersection point and a center point of a reflection member surface, the intersection point being the intersection of a line perpendicular to the facing surface extending through an endpoint of the leaf side of the leading end of the eye to the surface.