A suspension structure comprising: a suspension link through which a road wheel and a vehicle body are pivotably connected to each other; the suspension link having a hollow structure in which a pair of frame brackets, including a first frame bracket and a second frame bracket, are joined together, while opposing each other; and a stiffening bracket integrally connected to both the frame brackets for holding and sandwiching the frame brackets together, characterized in that the stiffening bracket comprises a V-shaped cross-section structure having a first sandwiching-and-holding structural section and a second sandwiching-and-holding structural section formed by mountain-folding and bending a steel material with respect to the suspension link, the first sandwiching-and-holding structural section having a first engagement edge and the second sandwiching-and-holding structural section having a second engagement edge, and each of the first and second engagement edges being configured to be conformable to an outer peripheral surface of the suspension link and structured to hold and sandwich both the frame brackets so as to permit stresses occurring in the suspension link and induced by a load input to be dispersed, wherein the stiffening bracket is configured to hold and sandwich both an outer end face of the first frame bracket facing apart from the mating face with the second frame bracket and an outer end face of the second frame bracket facing apart from the mating face with the first frame bracket together via the first and second engagement edges of the first and second sandwiching-and-holding structural sections. a suspension link through which a road wheel and a vehicle body are pivotably connected to each other; the suspension link having a hollow structure in which a pair of frame brackets, including a first frame bracket and a second frame bracket, are joined together, while opposing each other; and a stiffening bracket integrally connected to both the frame brackets for holding and sandwiching the frame brackets together, characterized in that the stiffening bracket comprises a V-shaped cross-section structure having a first sandwiching-and-holding structural section and a second sandwiching-and-holding structural section formed by mountain-folding and bending a steel material with respect to the suspension link, the first sandwiching-and-holding structural section having a first engagement edge and the second sandwiching-and-holding structural section having a second engagement edge, and each of the first and second engagement edges being configured to be conformable to an outer peripheral surface of the suspension link and structured to hold and sandwich both the frame brackets so as to permit stresses occurring in the suspension link and induced by a load input to be dispersed, wherein the stiffening bracket is configured to hold and sandwich both an outer end face of the first frame bracket facing apart from the mating face with the second frame bracket and an outer end face of the second frame bracket facing apart from the mating face with the first frame bracket together via the first and second engagement edges of the first and second sandwiching-and-holding structural sections.