A magnetic head slider includes a magnetic head for recording/reproducing information from/into a magnetic disk and a slider on which the magnetic head is mounted. The slider has a first positive pressure generating portion provided at an air-inflow side and a positive pressure generating portion surface provided at an air-outflow side. Projections are provided at the air-inflow side respect to the first positive pressure generating portion on a surface which faces the magnetic disk upon read/write operation of the magnetic head slider.