To provide a PET bottle or plastic made drink container that enables heat and cold insulation.

The PET bottle (symbol 11) or plastic made drink container enabling heat and cold insulation has a dual structure of inside (symbol 1) and outside (symbol 2), and is so arranged that objects of riblike (symbol 4) or of thin sheetlike, or of protrusionlike are provided, from inside to outside or from outside to inside, so that the inside and the outside are reinforced while the hollow portions (symbol 8) between the inside and the outside enable heat and cold insulation with the hollow portions being kept in a state of vacuum, medium- or low-degree of vacuum, or in air-filled normal condition, and, in order to enhance the effect of heat and cold insulation, an object which blocks light or light and heat or which reflects them (symbol 3), (such as a film or aluminum foil, etc., that is vacuum-deposited with aluminum) is fitted or applied on the outer surface of the inside of the dual structure, or on the outer surface of the outside, or on the inner surface of the outside.