To provide a band plate screw whose outer periphery part becomes relatively thick in the plate thickness.

Axial directions of a pair of rolling rollers 22, 26 whose conical rolling parts 21, 25 are faced each other are set so that a gap between both conical rolling parts of the rolling rollers inclines at the angle θ2. The band plate screw 2 is rolled and formed by making a steel made plate stock 1 pass between both conical rolling parts 21, 25 and rolling it. A recessed difference 23 in level having a suitable depth which is omnipresent in a narrow side of the inclined gap is constituted in one conical rolling part 25 of a pair of conical rolling rollers 22, 26, and the band plate stock 1 is inserted and rolled. The reduction of the outer diameter side plate thickness of the band plate screw 2 to the plate thickness of the band plate stock 1 is lessened by forming a thick wall part 3 in the front surface or/and rear surface of the outer diameter side which is thin rolled to shape the outer peripheral part of the band plate screw 2.