Waterproof structure for outer roof

1. A waterproof structure for an outer roof applied to a gap between the outer roof and at least one of upper frames inclusive of a front upper frame, a pair of right and left lateral upper frames and a rear upper frame of a cabin so as to liquid-tightly seal an inner space of the cabin from an outside, the waterproof structure includes:

a sealing plate that is fixed directly or indirectly to the one upper frame to form a cabin member and has an outward extending region located outside the one upper frame, a first elastic sealing member that is sandwiched between the cabin member and the outer roof, and a second elastic sealing member attached to the outer roof,

wherein the outer roof includes a main body region that covers an upper portion of the inner space of the cabin, an outer peripheral region that defines an outer peripheral edge of the main body region, and an outer region that is located outside the outer peripheral region,

wherein the second elastic sealing member includes an attached site that is attached to a free end of the outer region, and a sealing site that extends from the attached site so as to be pressed against the outward extending region of the sealing plate,

wherein the first elastic sealing member is sandwiched between the cabin member and the outer peripheral region to form a first sealing portion that seals the inner space of the cabin from the outside, and

wherein the sealing site of the second sealing member is pressed against the outward extending region to form a second sealing portion that seals the inner space of the cabin from the outside at a position outside the first sealing portion.

2. A waterproof structure for an outer roof according to claim 1 ,

wherein the free end of the outer region extends outward from an outer end of the outward extending region and terminates with facing downward, and

wherein the sealing site of the second elastic sealing member extends inward from the attached site in the state where the attached site is attached to the free end of the outer region so that the sealing site is pressed against an upper surface of the outward extending region in the state where the outer roof is attached to the cabin member.

3. A waterproof structure for an outer roof according to claim 1 , wherein the first elastic sealing member is positioned on or above the one upper frame.

4. A waterproof structure for an outer roof according to claim 1 , wherein the outer region of the outer roof is detachably fixed to the cabin member by means of a fastening member in a state of being placed on a boss that is arranged on an upper surface of the cabin member, and

wherein the boss has a length shorter than a vertical thickness of the first elastic sealing member when having a natural length.

5. A waterproof structure for an outer roof according to claim 1 , wherein the one upper frame is embodied by one of the lateral upper frames, wherein the outer peripheral region is concaved downward from sites of the main body region and the outer region that are adjacent thereto so that an upper surface of the outer peripheral forms a groove in a vehicle longitudinal direction, and

wherein the groove is opened toward a rear side of the outer roof with respect to the vehicle longitudinal direction.

6. A waterproof structure for an outer roof according to claim 5 , wherein an attachment stay is fixed to an inner surface of the one of the lateral upper frames, and

wherein the attachment stay restricts inward deformation of the first elastic sealing member while supporting a reinforcing frame that connects the one and the other one of the lateral upper frames.