PURPOSE:To provide a micro-structural body and its forming method, which is used as a probe or the like of a scanning probe microscope such as an STM (scanning tunneling microscope) and AFM (atomic force microscope), of which a production process is simple, and in which contamination of a tip (of probe) and deformation due to process are not caused, the tip is securely fixed, and wiring can be conducted to its rear face side. CONSTITUTION:In the micro-structural body composed of a lever 4 and a beam 5 which are formed by working a base board for working, an end of a tip 8 is protruded from the lever 4 and the tip 8 is formed continuously to a face of the lever 4 opposite to a support base board 2. This micro-structural body is formed by forming a groove of a shape corresponding to the lever 4 and the beam 5 on one side surface of the base board for working, forming the tip 8, joining the one side surface to the support base board 2, and applying etching from the other side surface of the base board for working to the groove part.