A loom comprising: a plurality of heddles that separate a part of a plurality of polyester yarn warps from the other part of the plurality of polyester yarn warps to form a shed between the part of the polyester yarn warps and the other part of the polyester yarn warps; a weft inserting unit that makes a polyester yarn weft pass through the shed; a reed that presses the polyester yarn weft, having been passed through the shed, against a fell to make a textile (11, 11A); a feeding roller that feeds the polyester yarn warps to the heddles; a tension roller (51, 52) that is placed between the feeding roller and the heddles; a let-off beam that feeds the polyester yarn warps to the feeding roller; and a textile winding beam that winds the textile (11, 11A), characterized in that the feeding roller feeds the polyester yarn warps to the heddles from a position displaced on one side from an imaginary plane passing through a center of a moving range of the heddles and the fell so that a path of the polyester yarn warp from the position to one of the heddles is longer than a path of the polyester yarn warp from the position to the other of the heddles, the central axis of the tension roller (51, 52) is displaced on one side from the imaginary plane, and the diameter of the tension roller (51, 52) is smaller than that of the feeding roller, the loom further comprises a controller that monitors the tension of the polyester yarn warps, and controls a rotational speed of at least one of the let-off beam and the textile winding beam so that the tension of the polyester yarn warps when the heddles are located at the center has a value larger than or equal to 0.32 cN/dtex and smaller than or equal to 0.38 cN/dtex, and the imaginary plane is a horizontal plane, and a warp line connecting the position, the center, and the fell bends upward from the center toward the feeding roller. a plurality of heddles that separate a part of a plurality of polyester yarn warps from the other part of the plurality of polyester yarn warps to form a shed between the part of the polyester yarn warps and the other part of the polyester yarn warps; a weft inserting unit that makes a polyester yarn weft pass through the shed; a reed that presses the polyester yarn weft, having been passed through the shed, against a fell to make a textile (11, 11A); a feeding roller that feeds the polyester yarn warps to the heddles; a tension roller (51, 52) that is placed between the feeding roller and the heddles; a let-off beam that feeds the polyester yarn warps to the feeding roller; and a textile winding beam that winds the textile (11, 11A), characterized in that the feeding roller feeds the polyester yarn warps to the heddles from a position displaced on one side from an imaginary plane passing through a center of a moving range of the heddles and the fell so that a path of the polyester yarn warp from the position to one of the heddles is longer than a path of the polyester yarn warp from the position to the other of the heddles, the central axis of the tension roller (51, 52) is displaced on one side from the imaginary plane, and the diameter of the tension roller (51, 52) is smaller than that of the feeding roller, the loom further comprises a controller that monitors the tension of the polyester yarn warps, and controls a rotational speed of at least one of the let-off beam and the textile winding beam so that the tension of the polyester yarn warps when the heddles are located at the center has a value larger than or equal to 0.32 cN/dtex and smaller than or equal to 0.38 cN/dtex, and the imaginary plane is a horizontal plane, and a warp line connecting the position, the center, and the fell bends upward from the center toward the feeding roller.