A string instrument contains: a string holding member that holds the end portions of strings; and a body reinforcement member that is inside a body portion and has a joining surface adhered to a front panel, a rear panel, and a side panel. A facing surface of a string holding section of the string holding member has a joining surface fixedly adhered to the front panel, the side panel, and the body reinforcement member. A portion of the front panel and the body reinforcement member is cut out, and the string holding member is disposed as fixedly adhered to the body reinforcement member.