PURPOSE: To provide a dripper having a large opening, which can be set on any of several kinds of cups having several shapes, without the base sheet of the dripper leaping.

CONSTITUTION: Two dripper base sheets 11 each formed in its center part with a folded part 15a, are secured together at opposite ends thereof, and a filter is disposed therebetween. Seal parts 19 are formed at parts 12b of the upper edges 12b, 12c of the filter 12. The filter 12 is secured to the dripper base sheets 11 by means of the seal parts 19. The remaining parts other than the seal parts 19 are set in a floating condition. When the opposite ends of the dripper base sheets 11 are pressed, the upper edge 12b of the filter 12 is flared so as to enlarge its opening. In this condition, a cup engaging piece 22 formed at the lower end of each of the seal parts 19 is engaged with a cup. At this time, the remaining parts other than the seal parts 19, is rotated about an end part D of the seal parts 19 as a rotary axis so as to form a rise-up part.