BAG FOR FILTER

PROBLEM TO BE SOLVED: To make it easy to put tea leaves or the like into a bag, by joining respective side edges of the first and second sheets in the range from the nearby position of the upper end of the bag to the lower end and forming mutually separable opening ends in the part of sheets which are not joined to each other within the range from the upper end of the bag to the lower end thereof. SOLUTION: A bag 1 is provided with joining lines 10 leaving the external side edges at both right and left side edges. In the lower part A of the joining line A, the lower part of the superposed side wall 4 is connected to the front end of the folded-back free end 6 so as not to be peelable. And in the upper part B of the joining line 10, the upper part of the side wall 4 is connected to the free end 6 so as not to be peelable and the upper part of the side wall 5 is connected to the free end so as not to be peelable to form the opening edges 14, 15 of the bag 1 respectively. Since the opening edges are mutually separable, when it is opened to form a cylindrical shape, these edges 14, 15 are widened to form a funnel and the shape is made stable and hence, tea leaves or the like can be easily contained in the bag 1.