A hand brace includes a wrist sheath and a finger holder. The finger holder has a height adjusting rod, a length adjusting rod, and a finger support. The height adjusting rod has one end pivotally connected to the wrist sheath, so that the height adjusting rod is allowed to adapt to a wearer's finger in terms of position. The length adjusting rod is connected to an opposite end of the height adjusting rod in an axially movable manner, so that the length adjusting rod is allowed to adapt to the wearer's finger in terms of length. The length adjusting rod has a joint portion that has pivotal connection with the finger support. Thereby, the hand brace provides the wearer's finger with sufficient and relevant support.