PURPOSE: To provide a percolator which can be easily fabricated owing to its simple shape in the base part of paper, can suppress the material cost for the base, and can easily be set in the upper part of a cup at the time of service.

CONSTITUTION: The peripheral edge 22 of a percolating sack 2 is attached to the rear surface of a base part of paper 1, and a pair of folding lines 4, 4 are formed in the base 1, and thus a percolator is formed, wherein the portions of base located outside the lines 4, 4 serve as supporting legs 5, 5. The outer edges 51, 51 of these legs 5, 5 are shaped without projection or recess, and the base 1 is folded at the lines 4, 4 till the service positions, wherein the undersurface 24 of the sack 2 is so arranged as protruding down from the outer edges 51, 51 of the legs 5, 5 when the sack 2 is spread. It is also arranged so that the bottom 25 of the sack 2 is inserted under the cup mouth edge level when this percolator is set on the cup mouth edge, and thereby the horizontal movement of the percolator is restricted by the bottom 25 of the sack 2.