PURPOSE: To provide the manufacture of a belt with open end tooth, in which the generation of the thrust force at the time of belt travelling is hindered and the belt is made travel straight to reduce the noise at the time of travelling and the abrasion of the side surface of the belt and of which lifetime is improved.

CONSTITUTION: A cylindrical spiral-tooth die 1 having projecting parts 3 ad recessed parts 4, which are arranged alternately and inclined at an angle αagainst the axial direction 2, is used. The surface of this die 1 is wound by a cover duck having the expansible characteristic so that the twill line 14 thereof is formed in the direction opposite to the inclined direction of the projecting parts 3, and cords 6 are spun at an angle γ, which is 90 degrees or more, against the inclined direction of the projecting part 3. After winding a non-vulcanized rubber sheet, vulcanization is performed to obtain a cylindrical sleeve 9, which has tooth parts 10 and groove parts alternately, and this vulcanized sleeve 9 is cut continuously and spirally at an angle β, namely, a right angle against the tooth parts 10.