To eliminate a flexible tube to supply a spraying agent or air and to reduce the cost by providing an accumulator to store a spraying agent and a spraying nozzle to spray the spraying agent on a spraying head.

On the command of starting spraying, a control valve 44 of a supplying path 44b passing through from an accumulator 40 to each spraying nozzle is made on, and a release agent is supplied to each nozzle. By supplying a pilot air to a 1st supplying path 50, a spray valve of the spraying nozzle positioned on the forming face side of a fixing die is opened, the air and the release agent are blown on the forming face of the fixing die in the mixed state. Further, when the pilot air is supplied to a 2nd supplying path 51, the spray valve of the spraying nozzle positioned on the forming face side of a moving die is opened and the release agent is sprayed. After spraying is completed, on the command of starting air blowing, the control valve 45 of the supplying path 41b is made on, the forming face of the fixing die and the moving die are blown with air.