To provide a close adhesion structure between members in which detachment of packing hardly occurs even if repeatedly used.

A sealing structure with a double waterproof line is obtained by fitting two skirt parts 11, 12 with different projection amounts to the fitting face of a fitting mate. The detachment of the packing is prevented by preventing rotation of the packing itself caused by the friction with the inner face of the case of the packing 1 during fitting between the members or during detaching. A further deeper recessed part 22 is formed inside the recessed part 21 in which the packing 1 is held. The packing is formed into shapes suitable for the recessed part shapes 21, 22. As a result, the rotation of the packing 1 itself is further prevented.