The present invention relates to a tightening system for footwear, especially in athletic shoe, and is directed to improve the fittability, supportability and stability of the shoe. The athletic shoe of the present invention includes a supporting portion (Fs) for supporting the lateral side of a foot of a shoe wearer, a first fastening element of a loop shape that surrounds the periphery of the calcaneus (f
) of the foot, and a second fastening element of a loop shape that is provided integrally with the supporting portion (Fs). The supporting portion(Fs) extends from the position in the vicinity of the head of the metatarsus on the lateral side of the foot over the rear portion of the calcaneus of the foot to the medial side. The first fastening element, which is integrated with the terminus (Fs′) of the supporting portion (Fs), extends upwardly to the position corresponding to the navicular (f
) on the medial side, and passes over the instep above the navicular (f
), and returns to the lateral side of the foot and to the calcaneus lateral side of the supporting portion (Fs). The second fastening element extends from the medial side to the lateral side on the rear side of the base position of the proximal phalanx (f
) of the foot. The first and second fastening elements include medial side, lateral fastening elements (F
′) that are provided on the lateral side, and joining parts that join the medial fastening elements to the corresponding lateral fastening elements.