Abstract: Bucket dredger, comprising: a swivelling ladder connected to a vessel, a driven upper wheel at the top end and a polygonal lower wheel (7) at the lower end of the ladder, one or more endless chains (6) which are guided along both wheels, and buckets (9) connected to the shackles (8) of these chains (6). For receiving the lateral force exerted on a bucket the bottom wall (12) of each bucket (9) is provided with two ribs (15) extending downwardly, which extend substantially parallel to the side walls (14) of the bucket and which, in the assembled state of the bucket, extend adjacent the chains (6) and between the chains and upright edges (16) placed on the lower wheel (7). The ribs (15) can extend along the length of two shackles (8).