A balloon catheter (10; 20; 30; 40; 50; 90) comprising: a balloon/shaft assembly that includes a catheter shaft extending from a proximal end to a distal end and a balloon connected to the catheter shaft, the balloon having an inflatable region capable of inflating outward in a radial direction around the catheter shaft and proximal and distal end side cone regions (32, 34); and a linear member (4; 6; 7; 8; 9) straddling the inflatable region of the balloon and being mounted on the balloon/shaft assembly at a distal end position located further toward the distal end side than the inflatable region and at a proximal end position located further toward the proximal end side than the inflatable region, and wherein the linear member includes: a hard portion (42; 62; 71; 82; 92) that includes at least an outer portion disposed on an opposite side to an inner portion facing the inflatable region, of a portion disposed along an outer peripheral surface of the inflatable region in an inflated state of the balloon, and a flexible portion (41; 61; 72; 81, 83; 91) that is a portion other than the hard portion, the flexible portion being extendable and having a lower hardness than the hard portion, wherein when the balloon is in the inflated state, the inflatable region, a portion of the flexible portion that the hard portion is laminated on, and the hard portion overlap, wherein radiopaque markers (22A, 22B) are respectively provided in two positions separated from each other in the extending direction of the catheter shaft, of the two markers, the position of the marker provided on the distal end side corresponds to a position of a boundary of the inflatable region on the distal end side, in the extending direction of the catheter shaft, and of the two markers, the position of the marker provided on the proximal end side corresponds to a position of a boundary of the inflatable region on the proximal end side, in the extending direction of the catheter shaft. a balloon/shaft assembly that includes a catheter shaft extending from a proximal end to a distal end and a balloon connected to the catheter shaft, the balloon having an inflatable region capable of inflating outward in a radial direction around the catheter shaft and proximal and distal end side cone regions (32, 34); and a linear member (4; 6; 7; 8; 9) straddling the inflatable region of the balloon and being mounted on the balloon/shaft assembly at a distal end position located further toward the distal end side than the inflatable region and at a proximal end position located further toward the proximal end side than the inflatable region, and wherein the linear member includes: a hard portion (42; 62; 71; 82; 92) that includes at least an outer portion disposed on an opposite side to an inner portion facing the inflatable region, of a portion disposed along an outer peripheral surface of the inflatable region in an inflated state of the balloon, and a flexible portion (41; 61; 72; 81, 83; 91) that is a portion other than the hard portion, the flexible portion being extendable and having a lower hardness than the hard portion, a hard portion (42; 62; 71; 82; 92) that includes at least an outer portion disposed on an opposite side to an inner portion facing the inflatable region, of a portion disposed along an outer peripheral surface of the inflatable region in an inflated state of the balloon, and a flexible portion (41; 61; 72; 81, 83; 91) that is a portion other than the hard portion, the flexible portion being extendable and having a lower hardness than the hard portion, wherein when the balloon is in the inflated state, the inflatable region, a portion of the flexible portion that the hard portion is laminated on, and the hard portion overlap, wherein radiopaque markers (22A, 22B) are respectively provided in two positions separated from each other in the extending direction of the catheter shaft, of the two markers, the position of the marker provided on the distal end side corresponds to a position of a boundary of the inflatable region on the distal end side, in the extending direction of the catheter shaft, and of the two markers, the position of the marker provided on the proximal end side corresponds to a position of a boundary of the inflatable region on the proximal end side, in the extending direction of the catheter shaft.