To provide a method for applying powder on the inside surface of a green tire, by which the powder is uniformly applied without splashing to the outside, and also provide a device therefor.

A lower part powder splashing preventing cap 4, which is provided with a supporting member provided with slits at a prescribed interval in the peripheral direction and composed of a rubber like elastic body and is composed of a transparent resin made material, is provided on a tire placing table 1. An upper part powder splashing preventing cap 7, which is provided with a supporting member 6 provided with slits at a prescribed interval in the peripheral direction and composed of the rubber like elastic body and is composed of the transparent resin made material, is provided on the upper part of the opening part of the green tire W. A suction hose 8 for turning the pressure inside the green tire to a negative at applying the powder Q is connected to the near center part of the under part powder splashing preventing cap 4 and the upper part powder splashing preventing cap 7 respectively, a powder supply nozzle 9 for supplying the powder Q is connected to at least equal to or more places of the upper powder splashing preventing cap 7 and the powder supply nozzle 9 is connected to the powder supply device.