A suspension arm attachment structure provided with a cylindrical vibration-damping bush which is attached to the side of a vehicle body via a core member. The attachment structure is provided with: a suspension arm having an attachment tube part fitted with a vibration-damping bush; and a retaining member which regulates the movement of the attachment tube part in the axial longitudinal direction. The retaining member is provided with: facing walls on sides thereof which respectively face end surfaces of the vibration-damping bush; a linking part which integrally links the facing walls; and an attachment part on one end and an attachment part on the other end which respectively extend in the axial longitudinal direction of a core member from the facing surface on one side and the facing surface on the other side and which are attached to the side of a vehicle body.