IN-VEHICLE BATTERY ATTACHMENT STRUCTURE

An in-vehicle battery attachment structure is to be disposed under a rear seat of the vehicle. The in-vehicle battery attachment structure includes at least one left battery module and at least one right battery module, a housing case, and a battery frame. The at least one left battery module and the at least one right battery module are to be disposed apart from each other in a left-right direction of the vehicle. The housing case houses the at least one left battery module and the at least one right battery module. The at least one left battery module, the at least one right battery module, and the housing case are attached to the battery frame in a suspended state. The battery frame is to be fixed to a vehicle body of the vehicle. The rear seat is attached to the battery frame.