A supporter comprising: A first anchor portion that is formed on a first end side of a tubular fabric and configured to fasten the tubular fabric to a forearm wrist portion of a wearer; a second anchor portion that is configured to form a circling portion on a second end side of the tubular fabric opposite the first end side into a first opening portion and a second opening portion, the first and second opening portions (12a, 12b) having different sizes; a first support portion that is positioned between the second anchor portion and the first anchor portion, the first support portion being configured to support a finger or thumb of the wearer inserted into a smaller one of the opening portions (12a, 12b) and having a first tensile force (F L2) in a length direction of the tubular fabric between the first and second anchor portions (2, 3); a base portion that is positioned between a larger one of the opening portions (12a, 12b) and the first anchor portion, the base portion having a second tensile force (F L1) in the length direction of the tubular fabric between the larger one of the opening portions (12a, 12b) and the first anchor portion; and a second support portion that is spaced from the first support portion by the base portion, wherein the first tensile force (F L2) is greater than the second tensile force (F L1), the second anchor portion is formed by being sewn from outside with two points on an inner side of the circling portion on the second end side of the tubular fabric adhering to each other, the second anchor portion is formed to be located between a metacarpophalangeal joint and a proximal interphalangeal joint or an interphalangeal joint of the finger or thumb of the wearer when the supporter is worn, the first support portion passes through a side surface of the finger or thumb of the wearer from a vicinity of the second anchor portion and is supported by the first anchor portion, the vicinity of the second anchor portion being defined as a range in which a support force of the second anchor portion is reachable, and the second end side of the tubular fabric has an S curved shape. A first anchor portion that is formed on a first end side of a tubular fabric and configured to fasten the tubular fabric to a forearm wrist portion of a wearer; a second anchor portion that is configured to form a circling portion on a second end side of the tubular fabric opposite the first end side into a first opening portion and a second opening portion, the first and second opening portions (12a, 12b) having different sizes; a first support portion that is positioned between the second anchor portion and the first anchor portion, the first support portion being configured to support a finger or thumb of the wearer inserted into a smaller one of the opening portions (12a, 12b) and having a first tensile force (F L2) in a length direction of the tubular fabric between the first and second anchor portions (2, 3); a base portion that is positioned between a larger one of the opening portions (12a, 12b) and the first anchor portion, the base portion having a second tensile force (F L1) in the length direction of the tubular fabric between the larger one of the opening portions (12a, 12b) and the first anchor portion; and a second support portion that is spaced from the first support portion by the base portion, wherein the first tensile force (F L2) is greater than the second tensile force (F L1), the second anchor portion is formed by being sewn from outside with two points on an inner side of the circling portion on the second end side of the tubular fabric adhering to each other, the second anchor portion is formed to be located between a metacarpophalangeal joint and a proximal interphalangeal joint or an interphalangeal joint of the finger or thumb of the wearer when the supporter is worn, the first support portion passes through a side surface of the finger or thumb of the wearer from a vicinity of the second anchor portion and is supported by the first anchor portion, the vicinity of the second anchor portion being defined as a range in which a support force of the second anchor portion is reachable, and the second end side of the tubular fabric has an S curved shape.