PROBLEM TO BE SOLVED: To provide a sediment/dust removal device for a catch basin which can be easily installed in the catch basin and is capable of efficiently collecting sediment or dust and also easily and safely processing deposited sediment or dust, such that safety in cleaning work can be improved, labor of the aged can be reduced and work cost can be decreased.SOLUTION: A sediment/dust removal device comprises: a frame body which is assembled substantially in a square shape; leg parts which are mounted while drooping from the inside of corner parts positioned in an upper part, and set to an installation surface of a catch basin; a sediment/dust collection net which is mounted from a top face opening of the frame body to the internal lower side and in which the top face opening is defined as a sediment/dust storage opening; and a cord member which is mounted at a nearby position so as to surround the top face opening, fixes the collection opening to the frame body, is removed after collection to separat
