To improve suction efficiency of fluid owing to its feed under pressure by providing the first flexible passage means for communicating with a fluid storing means, and the second flexible passage means for communicating with inside and outside of a specified blocked space, and moving respective means while pushing them by means of a compressing means.

When a rotor 15 is driven in its rotation by means of a driving motor from its state in which a compression roller 15a starts to pressurize a rubber tube 12 for forcibly feeding concrete, and a compression roller 15b compresses concrete A included inside of a table 12 in front of its moving direction, and ejecting it from an ejection port 11, compression by the roller 15a is advanced to eject concrete A inside of the tube 12 is ejected from the ejection port 11b. Next, the roller 15b compresses a rubber tube 13 for air ventilation so as to extract the air inside of a casing 11 via a check valve 14 to attempt pressure reduction. Accordingly, the tube 12 is to expand owing to a pressure difference so that suction of the concrete A into the tube 12 from a hopper may be carried out under good efficiency.