A storage box seal structure includes a recess, a seal member provided in the recess, and a projection that comes into contact with the seal member for sealing, and has, at an opening, a centering structure for guiding opening and closing of a lid member. The centering structure includes a first rib and a second rib projecting from opposite edges of the recess, and a guide portion that guides at least one of the first rib and the second rib at opening and closing.

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