A resin container coating device comprising: a chamber which stores a plurality of resin containers and is an external electrode; a plurality of internal electrodes which are electrically grounded and are formed in a cylinder shape, in which gas conductive parts for conducting a source gas are formed to inner peripheral parts thereof, and which are respectively inserted inside the plurality of resin containers stored in the chamber; and a gas supply unit for supplying the source gas to the chamber, wherein: the gas supply unit includes a source gas supply path that communicates with a raw material reservoir in which a raw material of the source gas is reserved and a plurality of gas branch paths that branch from the source gas supply path and respectively communicate with the gas conductive parts of the plurality of internal electrodes, and supplies the source gas to the inside of the plurality of resin containers stored in the chamber through the source gas supply path, the plurality of gas branch paths, and the gas conductive parts of the plurality of internal electrodes, and characterized in that: the chamber includes a plurality of storage rooms that individually store each of the plurality of resin containers on a straight line, the source gas is supplied to the inside of each of the plurality of resin containers stored in the chamber so as to form a film thereto, and a mass flow controller for controlling a flow rate of the source gas is provided to the source gas supply path, and flow rate control valves whose closing degrees can be controlled so as to control balance of the flow rates of the source gas flowing into the plurality of resin containers so as to cancel the influence of variation of high frequency power in the chamber are respectively provided to the plurality of gas branch paths. a chamber which stores a plurality of resin containers and is an external electrode; a plurality of internal electrodes which are electrically grounded and are formed in a cylinder shape, in which gas conductive parts for conducting a source gas are formed to inner peripheral parts thereof, and which are respectively inserted inside the plurality of resin containers stored in the chamber; and a gas supply unit for supplying the source gas to the chamber, the gas supply unit includes a source gas supply path that communicates with a raw material reservoir in which a raw material of the source gas is reserved and a plurality of gas branch paths that branch from the source gas supply path and respectively communicate with the gas conductive parts of the plurality of internal electrodes, and supplies the source gas to the inside of the plurality of resin containers stored in the chamber through the source gas supply path, the plurality of gas branch paths, and the gas conductive parts of the plurality of internal electrodes, and characterized in that: the chamber includes a plurality of storage rooms that individually store each of the plurality of resin containers on a straight line, the source gas is supplied to the inside of each of the plurality of resin containers stored in the chamber so as to form a film thereto, and a mass flow controller for controlling a flow rate of the source gas is provided to the source gas supply path, and flow rate control valves whose closing degrees can be controlled so as to control balance of the flow rates of the source gas flowing into the plurality of resin containers so as to cancel the influence of variation of high frequency power in the chamber are respectively provided to the plurality of gas branch paths. the chamber includes a plurality of storage rooms that individually store each of the plurality of resin containers on a straight line, the source gas is supplied to the inside of each of the plurality of resin containers stored in the chamber so as to form a film thereto, and a mass flow controller for controlling a flow rate of the source gas is provided to the source gas supply path, and flow rate control valves whose closing degrees can be controlled so as to control balance of the flow rates of the source gas flowing into the plurality of resin containers so as to cancel the influence of variation of high frequency power in the chamber are respectively provided to the plurality of gas branch paths.