A thin-film magnetic head includes a lower magnetic layer, an upper magnetic layer, a recording gap layer, and a thin-film coil. The lower magnetic layer has a first magnetic pole tip layer, and a first yoke layer which is connected to the first magnetic pole tip layer. The first yoke layer has an extended part which is relatively thick and a reduced part which is relatively thin in the area in which the first yoke layer confronts the first magnetic pole tip layer, the extended part being positioned on the side of the air bearing surface. Further, the first magnetic pole tip layer is connected to the first yoke layer at the extended part, and is insulated from the first yoke layer at the reduced part.