To provide a holding fixture that can reliably hold an object to be held in connection with the fastening operation of a fastening means.

A holding member has a holder to store a body, and the fastening means 4. The holder has a cylinder 1, having three kerfs that are arranged at intervals of 120°, and a base 2 that is fixed at the one end. The inside of the fastening means 4 has three circular depression parts 11, 12, 13 that are arranged at intervals of 120°. Each space in the circular depression parts contacts to the kerf of the cylinder 1 adjacent to each other. Therefore, symmetric force is applied on the outer circle of the cylinder 1 by fastening the fastening means 4. Furthermore, the fastening means 4 is free to the base 2 of a holder and is flexibly inserted on the cylinder 1. When the fastening means 4 is fastened, the fastening means 4 doesn't apply inhomogeneous force to the holder. The cylinder 1 can have the continuous thin thickness wall that may be deformed, when force is applied by the fastening means 4.