A steering system comprising: a column jacket that includes a lower jacket, and an upper jacket having a tubular shape, the upper jacket being fitted into the lower jacket so as to be slidable with respect to the lower jacket in a column axis direction within a specified sliding range during telescopic adjustment, and the upper jacket moving integrally with a steering member in the column axis direction; an engagement member that is supported by the lower jacket; a retaining member that is fixed to an outer periphery of the upper jacket and moves integrally with the upper jacket during the telescopic adjustment; and a buffer member that is retained by the retaining member so as to face the engagement member in the column axis direction and contacts the engagement member in a contact direction at a time when the upper jacket is displaced to one sliding end of the specified sliding range, wherein the retaining member includes a support surface that extends in the column axis direction, characterized in that the support surface faces outward in a radial direction of the upper jacket, and supports the buffer member in the radial direction; paired holding portions that are respectively disposed on both sides of the buffer member in a circumferential direction of the upper jacket and hold the buffer member toward the support surface; and a restriction portion configured to be engaged with an end of the buffer member on a side toward which an opposite direction is directed, so as to restrict movement of the buffer member in the opposite direction, the opposite direction being opposite to the contact direction. a column jacket that includes a lower jacket, and an upper jacket having a tubular shape, the upper jacket being fitted into the lower jacket so as to be slidable with respect to the lower jacket in a column axis direction within a specified sliding range during telescopic adjustment, and the upper jacket moving integrally with a steering member in the column axis direction; an engagement member that is supported by the lower jacket; a retaining member that is fixed to an outer periphery of the upper jacket and moves integrally with the upper jacket during the telescopic adjustment; and a buffer member that is retained by the retaining member so as to face the engagement member in the column axis direction and contacts the engagement member in a contact direction at a time when the upper jacket is displaced to one sliding end of the specified sliding range, wherein the retaining member includes a support surface that extends in the column axis direction, characterized in that the support surface faces outward in a radial direction of the upper jacket, and supports the buffer member in the radial direction; paired holding portions that are respectively disposed on both sides of the buffer member in a circumferential direction of the upper jacket and hold the buffer member toward the support surface; and a restriction portion configured to be engaged with an end of the buffer member on a side toward which an opposite direction is directed, so as to restrict movement of the buffer member in the opposite direction, the opposite direction being opposite to the contact direction.