NOVELTY - The battery mounting structure (10) a wire harness (40) that is connected to a terminal (42) connected to an electrode of a battery (12) and is placed forward of the battery in a vehicle and is displaced to one side of a bracket (30) in a vehicle width direction. A guiding portion (32) extends from an upper end portion of the bracket to a side portion of the bracket on one side in the vehicle width direction and guides the wire harness to a position in a routed state by sliding wire harness to one side in vehicle width direction when wire harness contacts guiding portion.    USE - Battery mounting structure for mounting battery as auxiliary device in vehicle such as hybrid vehicle.    ADVANTAGE - The wire harness is guided by the guiding portion to the position in the routed state, and thus is connected efficiently. The procedure for connecting the terminal that is connected to the wire harness to the electrode of the battery can be improved. The wire harness is prevented from rubbing against a ridge portion of the bracket and to guide the wire harness further smoothly, when the terminal that is connected to the wire harness is being connected to the electrode of the battery. Since the extended portion that extends toward front of the vehicle is formed on both of the end portions of the bracket in the vehicle width direction, when a component that is placed forward of a bracket in the vehicle hits the bracket during a frontal collision of the vehicle, a displacement of the bracket in a right and left direction is restricted between the right and left extended portions. Since the bracket is placed rearward of the joining flange in the vehicle that is formed on each of the rear end portions of the inner panel and the outer panel of the rear wheel house and is joined to each other, the joining flange hits the bracket when the battery moves toward the front of the vehicle by inertia during the frontal collision of the vehicle. Thus it is made possible to prevent or effectively restrict the direct interference of the joining flange of the rear wheel house with the battery during the frontal collision of the vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows the side view illustrating the battery mounting structure when seen from an inner side in a vehicle width direction.    Battery mounting structure (10)    Battery (12)    Bracket (30)    Guiding portion (32)    Wire harness (40)    Terminal (42)