To provide a rubber bushing capable of regulating spring characteristics perpendicularly to an axial direction, and enlarging spring characteristics in the axial direction in a rubber bushing fixed with the axial direction set vertical to a vehicle to a rear axial hole of a lower arm as an L-shaped metal fitting.

The rubber bushing 10 is provided with an inner cylinder metal fitting 11, an outer cylinder metal fitting 15 disposed apart from the inner cylinder metal fitting diametrically outward of it, and coaxially to it, and a rubber elastic material main body 21 disposed between the inner and the outer metal fittings to elastically connect both metal fittings to each other. On an outer circumferential surface of the inner cylinder metal fitting, a circular projection 13 diametrically projected comprising side surfaces in the axial direction as perpendicular surfaces 13a perpendicular to the axial direction is provided at a center part in the axial direction. A rubber elastic material projection 25 is integrally provided to be projected outward in an axial direction from a part of the rubber elastic material main body in a circumferential direction on both end sides in an axial direction of the rubber elastic material main body.