To provide a method of manufacturing magnetic head slider which is capable of improving the product quality, simplifying the manufacturing process, and reducing the manufacturing time. This method of manufacturing a magnetic head slider, formed by cutting out from a block member, includes the steps of: processing an end face of the block member forming one surface of a magnetic head slider; holding fixedly the end face of the block member processed; and while maintaining a holding state provided by the step of holding, cutting a portion of the end face side of the block member, and processing a cut surface of the cut portion forming another surface of the magnetic head slider.