To provide a steel sheet pile structure that eliminates the need to install a cover at a joint part, and has superior anticorrosiveness, and a steel sheet pile which forms the steel sheet pile structure.

A steel sheet pile structure 1 is formed by connecting first, second Z-shaped steel sheet piles 5, 7 each having a double corrosion-proof coating 3 provided on one surface and having joint parts 17, 21 and 41, 49 at both ends, and characterized in that the joint parts 17, 21 and 41, 49 are provided without projecting to surface sides where double corrosion-proof coatings 3 are provided, and the distance of the gap between the double corrosion-proof coatings 3 of the connected first, second Z-shaped steel sheet piles 5, 7 is 20 mm or less while the joint parts of the adjacent first, second Z-shaped steel sheet piles 5, 7 are connected to each other.