To provide a filth housing bag capable of visibly confirming filth clearly and capable of certainly grasping filth to house the same in a bag body.

A filth housing bag 1 is a housing bag composed of a reversible bag body 2 having a bag opening part on the terminal end side thereof and thermally fused at the positions of welding lines 13, 14 in a watertight state on the leading end side thereof, and a first finger inserting bag part 3 into which a certain finger is inserted and a second finger inserting bag part 4 formed so as to freely approach and separate with respect to the first finger inserting bag part 3 to permit the insertion of other fingers are provided at the body 2 on the leading end side thereof and the rear surface side of the bag body 2 can be seen through a gap part 5 generated between the first and second finger inserting bag parts 3, 4. The side edge parts 8, 9 of the bag body 2 from the terminal side thereof to the leading end side thereof have respectively inwardly folded parts 6, 7 having an almost Σ-shaped cross-section. The folded parts 6, 7 extend to the whole or a part of the first and second finger inserting bag parts 3, 4 from the terminal end side.