An area in which an insulating film is formed over a substrate of a recording/reproducing separated type head is limited to the vicinity of a GMR film. This enables heat of Joule heating by a coil to be guided to the substrate without being obstructed by the insulating film. Electrodes, an upper shield film, a lower shield and a lower pole that are formed in-between are metallic thin films of high thermal conductivity, and accordingly have little influence. Similarly, gap films and a separation film that are positioned in-between, though they are electrically insulating films made of A1₂O₃, have no great influence because of their thinness. According to the invention, a rise of the head's own temperature is restrained by efficiently radiating heat generated by the head itself to the substrate. As a result, it is thereby made possible to provide a highly reliable recording/reproducing separated type head whose deformation quantity is smaller and which can avoid coming into contact with a recording medium.