A battery mounting structure for a vehicle includes a battery frame upper fabricated of fiber-reinforced resin, a battery frame lower fabricated of fiber-reinforced resin, and an intermediate member fabricated of fiber-reinforced resin. A battery that is disposed at a vehicle body lower side of a floor panel is attached at the battery frame upper. With the battery frame upper the battery frame lower structures a closed cross section structure. The intermediate member is interposed between the battery frame upper and the battery frame lower. The intermediate member is provided with a plural number of upper end portions that abut against or are disposed close to a lower face of the battery frame upper and a plural number of lower end portions that abut against or are disposed close to an upper face of the battery frame lower.