A battery holding structure includes a battery tray for storing a battery therein. A battery holding rack is configured to store the battery tray with the battery stored therein and to allow the battery tray to be pulled out along widthwise directions of the vehicle. A ground wire has one end connected to a negative terminal of the battery and another end connected to a grounding member on a vehicle frame. A movement prevention member fixes the other end of the ground wire to the battery tray and prevents the battery tray from being pulled out to one side along the widthwise directions of the vehicle with the ground wire which is connected to the grounding member.