Embodiments of the invention enhance a mounting precision of a head gimbal assembly with respect to a carriage. In one embodiment, a rotating disk storage device comprises a magnetic disk; head gimbal assemblies each including a slider provided at a front end thereof and a mounting portion provided at a rear end thereof, the slider including a head for reading data from the magnetic disk; and a carriage holding a voice coil. The carriage is formed with a pivot opening into which a pivot cartridge for turning about a pivot shaft is inserted and mounting surfaces on which the mounting portions of the head gimbal assemblies are mounted, and a first pad, a second pad and a third pad projected so as to come into partial face contact with the head gimbal assemblies on the mounting surfaces.