To provide a PET bottle which is sanitary and free from any disagreeable feeling when the beverage is drunken by at least two persons by blocking a middle part of the cylindrical PET bottle through a thin-walled part, and providing an opening in both upper and lower parts to allow two kinds of beverages to be drunken in one PET bottle.

A middle part of a cylindrical PET bottle body 1 is blocked through a thin-walled part 2, and an upper lid 3 and a lower lid 4 are provided on upper and lower openings. The thin-walled part 2 can be provided at an arbitrary part of the cylindrical PET bottle body 1. In addition, a recessed part can be provided on a center part of the PET bottle body 1 so as to easily grip the center part of the PET bottle body 1 by hand. Two PET bottles need not be carried at the same time. A single bottle is not bulky, and this structure is effective when a person wishes to drink water a little after the person enjoys a sweet beverage such as a juice. Since the openings are large in size, the beverage can be cooled with ice, etc., placed therein.