An upper of a shoe covering at least a part of a foot, the upper comprising: a medial portion covering a medial surface of the foot; a lateral portion covering a lateral surface of the foot; panel portions provided in the medial portion and/or the lateral portion while being spaced apart from each other in a front-rear direction of the foot and extending in a foot girth direction crossing the front-rear direction of the foot; and string portions formed from linear members extending in the front-rear direction, and arranged so as to extend between a pair of the panel portions that are adjacent to each other in the front-rear direction, wherein the panel portions and the string portions are formed from a single piece of fabric, characterised in that an average value of a width of the panel portions in the front-rear direction is greater than an average value of a thickness of the string portions in the girth direction, each of the panel portions is in a strip shape extending in the girth direction and defines through holes that are spaced apart from each other in the girth direction, one of the string portions is passed through one of the through holes, and in each of the through holes, the panel portions fasten a circumference of each of the string portions, each of the string portions includes fastened portions that are fastened by the panel portions in the through holes of the panel portions, and exposed portions that are exposed between adjacent panel portions of the panel portions, and a thickness of the fastened portions in the girth direction is smaller than a thickness of the exposed portions in the girth direction. a medial portion covering a medial surface of the foot; a lateral portion covering a lateral surface of the foot; panel portions provided in the medial portion and/or the lateral portion while being spaced apart from each other in a front-rear direction of the foot and extending in a foot girth direction crossing the front-rear direction of the foot; and string portions formed from linear members extending in the front-rear direction, and arranged so as to extend between a pair of the panel portions that are adjacent to each other in the front-rear direction, wherein the panel portions and the string portions are formed from a single piece of fabric, characterised in that an average value of a width of the panel portions in the front-rear direction is greater than an average value of a thickness of the string portions in the girth direction, each of the panel portions is in a strip shape extending in the girth direction and defines through holes that are spaced apart from each other in the girth direction, one of the string portions is passed through one of the through holes, and in each of the through holes, the panel portions fasten a circumference of each of the string portions, each of the string portions includes fastened portions that are fastened by the panel portions in the through holes of the panel portions, and exposed portions that are exposed between adjacent panel portions of the panel portions, and a thickness of the fastened portions in the girth direction is smaller than a thickness of the exposed portions in the girth direction.