A cutting method comprising the steps of: causing a band saw blade to continuously and circularly run in such a manner that the band saw blade is supported by a band saw guide unit of a band saw machine; cutting a workpiece in a cutting region by relatively moving a band saw housing of the band saw machine in a cutting direction in which the band saw housing is approaching to the workpiece; and forcedly vibrating the band saw blade in a band width direction in the cutting region, thereby generating vibration; wherein a plurality of concave/convex portions or a plurality of notches are consecutively formed on a rear of the band saw blade; each of the plurality of concave/convex portions including a concave portion and a convex portion arranged adjacent to one another; the vibration is generated by engaging with and disengaging from the concave portions of the plurality of concave/convex portions or the plurality of notches from a backup guide (29,39) provided in the band saw guide unit; a length of each of the plurality of concave/convex portions or each of the plurality of notches is equal to or less than four times a maximum pitch (Tmax) of a tooth top of the teeth and equal to or greater than a minimum pitch (Tmin) of the tooth top of the teeth; and each of the plurality of concave/convex portions or each of the plurality of notches has such a size that an immersion amount of the backup guide (29, 39) with respect to the concave portion or the notch when the backup guide (29, 39) is engaged with the concave portion or the notch defines an amplitude of the vibration in the band width direction of the band saw blade which is equal to or higher than 0.1 mm and equal to or lower than 0.5 mm. causing a band saw blade to continuously and circularly run in such a manner that the band saw blade is supported by a band saw guide unit of a band saw machine; cutting a workpiece in a cutting region by relatively moving a band saw housing of the band saw machine in a cutting direction in which the band saw housing is approaching to the workpiece; and forcedly vibrating the band saw blade in a band width direction in the cutting region, thereby generating vibration; wherein a plurality of concave/convex portions or a plurality of notches are consecutively formed on a rear of the band saw blade; each of the plurality of concave/convex portions including a concave portion and a convex portion arranged adjacent to one another; the vibration is generated by engaging with and disengaging from the concave portions of the plurality of concave/convex portions or the plurality of notches from a backup guide (29,39) provided in the band saw guide unit; a length of each of the plurality of concave/convex portions or each of the plurality of notches is equal to or less than four times a maximum pitch (Tmax) of a tooth top of the teeth and equal to or greater than a minimum pitch (Tmin) of the tooth top of the teeth; and each of the plurality of concave/convex portions or each of the plurality of notches has such a size that an immersion amount of the backup guide (29, 39) with respect to the concave portion or the notch when the backup guide (29, 39) is engaged with the concave portion or the notch defines an amplitude of the vibration in the band width direction of the band saw blade which is equal to or higher than 0.1 mm and equal to or lower than 0.5 mm.