A device for filling containers by weight, the device comprises: a filler spout carried by a structure and having a delivery orifice; a container support member extending on one side of the filler spout, the container support member being associated with a weight sensor arranged at a level that is higher than the delivery orifice; and a connection arm having a first end fastened to the structure and a second end fastened to the container support member at a level below the weight sensor, the connection arm having two folding portions configured to enable effortless folding about mutually parallel horizontal axes, while providing a connection that is rigid against forces in a horizontal plane.