A lid for an opening device for a container includes a body having a longitudinal axis and provided with a top wall and with a side wall internally provided with a thread element suitable for cooperating with a further thread element of a spout of the opening device, the lid further including at least one driving element arranged to receive the fingers of a user during unscrewing of the lid from the spout and during screwing of the lid on the spout, the at least one driving element being delimited by an upper wall and by a lower wall extending from the side wall and spaced apart from each other along the longitudinal axis, the lower wall diverging from the upper wall when moving away from the side wall.