To provide a magnetic recording/reproducing device using a thin film magnetic head which can cope with various specifications.

In a pair of sliders 3a and 3b disposed by being confronted each other holding a magnetic disk 1 between them, 1st leader lines 6a2, 6b2 connected to center ends of coils Ca, Cb which are formed respectively on the sliders 3a, 3b, and 2nd leader lines 6a1, 6b1 connected to outer peripheral ends of the coils Ca, Cb which are positioned at the side opposite to a writing gap, are formed, then the leading out positions of the leading lines 6a1, 6b1 and 6a2, 6b2 are stipulated independently of the winding directions of the coils.