PURPOSE: A striking pin for fixing lagging materials is provided to obtain reliable bond strength without damaging lagging materials by compressing the lagging materials using a protrusion at the edge of a compressive fixing washer. CONSTITUTION: A striking pin for fixing lagging materials comprises a striking pin (30), a guide washer (40), a compressive fixing washer (50), and a diagonal uneven groove (60). The guide washer is mounted on the front end of the body of the striking pin. The outer circumference of the guide washer is formed with a plurality of blades (41) in order to maintain the horizontality of the body. The outer circumference of the compressive fixing washer is formed with a protrusion (51) to compress and fix the lagging materials by being attached to the guide washer. The diagonal uneven groove is formed on the body from the head to the tip end or on the bottom of the compressive fixing washer.
