Patent ID: 7558020

Claim:
A thin-film magnetic head comprising: a laminate of a main magnetic pole layer including a magnetic pole tip on a side of a medium-opposing surface opposing a recording medium, a write shield layer opposing the magnetic pole tip so as to form a recording gap layer on the medium-opposing surface side, and a thin-film coil wound about the write shield layer or the main magnetic pole layer; a base insulating layer including a magnetic pole forming depression sunken into a form corresponding to the main magnetic pole layer, the magnetic pole forming depression including a very narrow groove part having an even width portion that has a substantially even width, along a length of the very narrow groove part, the even width portion being formed in the very narrow groove part of the magnetic pole forming depression, wherein the magnetic pole forming depression has an even depth; wherein the main magnetic pole layer has a flat shape; and wherein the magnetic pole tip of the main magnetic pole layer includes the even width portion having a substantially even width along an extending direction.