Abstract: A general segment 20 which is propelled and set in an excavated hole by a propulsion excavating machine, and a flexible segment where flexible members 4 and rigid ring members are alternately installed and connected inside the skin-plate 7 provided on the outer periphery side of the side rings 5 having the same thickness as the general segment and a thrust-receiving member 9 is provided inside the flexible portion, are propelled and set by the propulsion excavating machine and then secondary coating concrete 30 including a secondary watertight band 15 is applied to said side ring. As a segment for a shield tunneling method, the flexible segment appropriately provides flexibility to quickly cope with earthquakes and uneven settlement. The flexible segment may be handled in the same manner as a standard general segment during excavation work, providing excellent application potential.