An extruding apparatus for food materials having a filling material and a wrapping material extrudes and envelops the filling material with the wrapping material. An internal cylinder supplies the filling material while a concentrically arranged external cylinder creates an annular space for extruding and enveloping the material supplied. The wrapping material is fluidized by a fluidizer accommodated in the annular space. A driving mechanism is sealed from the fluidizer and drives the fluidizer in the annular space. The driving mechanism is driven by a transmission mechanism. A storage space section near the seals prevents wrapping material from penetrating the driving mechanism.