A frame structure for an all-terrain vehicle includes upper main frame members and lower main frame members extending in a longitudinal direction of the frame structure. The lower main frame members have forward and rearward portions mounted to the upper main frame members and central portions extended in a lateral direction of the frame structure outward of the upper main frame members. A component mounting bracket is mounted to a forward end portion of the upper main frame members, upper forward suspension sub-frame members, and second sub-frame members disposed bridgingly between the upper main frame members and the upper forward suspension sub-frame members. A battery pack charger is mounted to the component mounting bracket in a space between component mounting bracket and a grille.