Gas barrier plastic molded body and a manufacturing method thereof

An object of the present invention is to provide a gas barrier plastic molded article having high gas barrier properties. Gas barrier plastic molded body according to the present invention includes a plastic molding, in gas barrier plastic molded body and a gas barrier film provided on the surface of the plastic molding, the gas barrier thin film is silicon as constituent elements (Si), contains carbon (C), oxygen (O) and hydrogen (H), and the Si content represented by the equation (1), having a Si-containing layer is not less than 40.1%. (Number 1) Si content [%] = {(Si content [atomic%]) / (Si, the total content of O and C [atomic%])} × 100 In Equation 1, Si, the content of O or C is a content of 3 elements breakdown of Si, O and C.