To provide a shock absorber for a two-wheeled vehicle that can effectively absorb a large amount of energy generated in case of a collision, and can be mounted easily on the two-wheeled vehicle. A lattice body of synthetic resin is formed by reducing the thickness of a plurality of plate ribs gradually from the proximal ends to the distal ends and disposing the plate ribs intersecting with each other. The lattice bodies are arranged in a stack such that the direction of the plate ribs extending from the proximal ends toward the distal ends is oriented along the fore-and-aft direction of the two-wheeled vehicle. The shock absorber is mountable at the front end of the two-wheeled vehicle.