DUST-COLLECTING DEVICE AND VACUUM CLEANER

A dust collecting device achieving higher efficiency in dust-and-dirt separation while suppressing adhesion of dust and dirt, and a vacuum cleaner equipped therewith. The dust-collecting device includes a cylindrical casing and an insertion part. The casing includes an introduction port allowing dust-containing air to be introduced inside. The insertion part is disposed inside the casing to allow swirling flow of the dust-containing air to be formed between the insertion part and an inner surface of the casing. The insertion part includes a cylindrical enlarged part, an opening part, and a wall part. The opening part is formed on a surface of the enlarged part in a side of a first centrifuge separator. The wall part projects at least at a position corresponding to an outside of the opening part, from the surface of the enlarged part in the side of the first centrifuge separator, toward the first centrifuge separator.