To facilitate working and connecting work by forming the connecting member consisting of a metallic shaft so as to have a large diameter part that is to be inserted into the connecting hole of a brittle member and a small diameter part that is projected from the connecting hole, and by forming slits for axially dividing the small diameter part and the large diameter part through the penetrating hole penetrating the large diameter part.

When a brittle member and a metallic member are combined, the large diameter part 2 of a connecting member 10 is pressedly reduced and inserted into the connecting hole of a brittle member 20. The inner part 22 of the connecting hole is formed so as to be slightly wider than the large diameter part 2, and when the large diameter part 2 is housed in this part 22, the pressing pressure is released so that it is returned to its original shape, and the step difference 4 (not shown) in the outer circumference of the connecting member 10 is engaged with the difference step 24 of the connecting hole for preventing the slipping off. Then, a pin 30 is inserted into the penetrating hole 5 (not shown) of the connecting member 10, and the large diameter part 2 is pressedly widened, so that the play of the connecting member 10 is eliminated, and the connecting member 10 and the connecting hole are strongly connected. By further screwing the end 31 of the pin into the bottom surface of the connecting hole, the connecting member 10 is pushed up, so that the difference step 4 is pushed against the difference step 24, and it is further strongly fixed.