A lid for an opening device (1) for a container (100) comprises a body (25) having a longitudinal axis (B) and provided with an end wall (27) and with a side wall (28) internally provided with a thread element (29) suitable for cooperating with a further thread element (30) of a spout (12) of said opening device (1), said lid (18) further comprises at least one driving element (50) having a first side (51) arranged to receive the fingers of a user during unscrewing of said lid (18) from said spout (12) and a second side (52) arranged for receiving the fingers of a user during screwing of said lid (18) on said spout (12), said first side (51) being defined by a wall (58; 58') and said second side (52) being defined by a cavity (59).
