is set to be large enough to prevent the raw material from being clogged with reference to fig1 to 6 a description will be given of a paper making apparatus according to a first embodiment of the invention as shown in fig1 to 3 a paper making apparatus 1 includes a stirring tank 2 and a paper making portion 3 the stirring tank 2 includes a middle cylinder 21 an outer cylinder 23 concentric with the middle cylinder 21 a raw material feeding port 24 air nozzles 25 as stirring mechanisms and jet holes 28 which are respectively secured to an aluminum top plate 26 the middle cylinder 21 has a substantially conical portion 22 in the lower end portion thereof the jet holes 28 jet water for cleansing the middle cylinder 21 and the outer cylinder 23 a seal ring 27 is also secured to the lower end portion of the outer cylinder 23 the paper making portion 3 is structured such that a wire cloth 31 is fitted to the top of a paper making frame 32 and a cover 34 for collecting moisture component such as the overflowed raw material is located in the outside of the paper making frame 32 reference numeral 38 denotes a water supply port 33 a moisture suction port 35 a discharge port of the cover 35 45 a central body and 46 an opening fig3 is a top view.