To provide a packaging product having a superior gas barrier characteristic.

There is provided a packaging product of high barrier characteristic, wherein inside part of a packaging product such as a film packaging bag, a paper packaging bag and a paper carton and the like is made vacuum, gas is blown into it, the gas is changed into plasma state by radiating a high frequency wave, the inner surface of the packaged product is formed with a film of vapor disposition of metallic oxides such as SiOx, Al2O3, MgO and the like or DLC(diamond-like-carbon), its stored content is hardly oxidized and additive agent is hardly transferred to the stored content.