A lid device driving an opening operation of a lid body by an urging member such as a coil spring and capable of opening the lid body securely. Of a guide portion for guiding an engaging end of the urging member of the lid device, a first guide portion for guiding the engaging end in moving the lid body from a closed position to an open position is provided with an initial guide portion and a later guide portion so that the urging member releases a large urging force when the engaging end is guided by the initial guide portion.