Abstract: Provided is a beverage bottle capable of keeping a carbonated beverage left over therein from going flat. The beverage bottle is provided with a bottle body having a volume-reducing structure capable of reducing the volume of the bottle body, a cap capable of sealing an opening of the bottle body, and a shrunken state-maintaining means provided on the bottle body to cause the bottle body having been reduced in volume to be maintained in the reduced volume state. The volume-reducing structure is configured of helical protrusions and recesses respectively formed on the bottle body, and the shrunken state-maintaining means is provided on a trunk section of the bottle body and is configured with a squeezing means for squeezing and maintaining the trunk section having been narrowed by being squeezed along the helical protrusions and recesses.