To stabilize running of a magnetic tape and to perform stable shaping processing in the shaping processing resolving/removing an end face protrusive part generated due to cutting by irradiating a laser beam.

In the manufacture of the magnetic tape T irradiating an ultraviolet laser beam or a visible laser beam LB on the end faces of the magnetic tape cut to a prescribed width while running the magnetic tape T and removing at least a part of projections existing on the end faces, a fixed guide member 11 contact-supporting at least one side of the rear surface/surface of the magnetic tape T is arranged on the irradiated part of the laser beam LB extending over the running direction of the magnetic tape T, and a length (a) from an upstream side contact position to a downstream side contact position in the running direction of the magnetic tape T of the fixed guide member 11 is set larger than the size of the laser beam LB on an irradiated position.