An information processing apparatus includes: a hard disk drive unit including a hard disk drive configured to read various data from and write various data in a magnetic disk incorporated therein; a housing of an apparatus main body configured to hold the hard disk drive on a substrate to be freely attached and detached; a hard-disk-drive holding member provided in the hard disk drive unit, configured to include a first anti-vibration member having vibration damping properties disposed on a predetermined surface parallel to a disk width direction of the magnetic disk and fix and hold the hard disk drive in a state in which the first anti-vibration member is sandwiched between the hard disk drive and the predetermined member, and formed of a metal member; a member to be guided provided in the hard disk drive unit and provided on a surface parallel to the disk width direction of the magnetic disk different from the predetermined surface of the hard-disk-drive holding member; and a base member provided in the housing of the apparatus main body, configured to have a guide section for guiding the member to be guided in attaching and detaching directions of the hard disk drive unit and come into contact with the hard-disk-drive holding member of the hard disk drive unit attached to the substrate according to the guide by the guide section, and formed of a metal member.