A cooking appliance comprising a base member, an upper member and a cooking chamber defined between the base member and the upper member, wherein the upper member is displaceable between a closed position, in which the upper member is closed on the base member and access to the cooking chamber is prevented, and an open position, in which access to the cooking chamber is permitted. The cooking appliance comprises a locking device displaceable from a locking condition, in which it prevents the upper member from being displaced from the closed position to the open position, and an unlocking condition in which it allows the upper member to be displaced from the closed position to the open position. The cooking appliance comprises an automatic actuating device for automatically taking the locking device in the unlocking condition upon a predetermined condition is reached, and a further manual actuating device for manually taking the locking device in the unlocking condition.