Unmanned self-propelled and self-steering device (1) for removing manure present on a floor, comprising a manure slide (4) and a drive for moving the device over the floor, whereby the manure slide is substantially U-shaped or V-shaped with two legs (7a. 7b) in order to define autonomously a manure-accommodating-space (25) which opens in forward direction and is closed in rearward direction, wherein the legs have a length (L) in the order of magnitude of the width (B) of the manure slide.