A vehicle sub-frame includes a hollow body having a hollow part thereinside formed by casting using a core. The hollow body includes a front wall and a rear wall. The front wall has a front bulging section formed to bulge outward at a position corresponding to a parting line. The front bulging section is formed on a part avoiding a top wall and a bottom wall of the hollow body. The rear wall has a rear bulging section formed to bulge outward at a position corresponding to the parting line. The rear wall is formed on a part avoiding the top wall and the bottom wall.