A 2-door or 3-door type vehicle having enhanced resistance against a side impact may comprise a reinforcement member that is configured to be inclinedly mounted at a side of the 2-door or 3-door type vehicle which is not equipped with a rear door for affixing the reinforcement member. The reinforcement member may be affixed to a center pillar and a side sill at respective opposite ends thereof. The reinforcement member may be affixed to a bulkhead which connects a side sill outer reinforce and a side sill inner reinforce of the side sill.