It is an object of the present invention to provide a slot-in type disk apparatus which can be reduced in thickness without deteriorating strength of a lever and a rear base. In a slot-in type disk apparatus, a base body 10 and a lid 20 constitute a chassis sheath, a disk-insertion opening 11 into which a disk is directly inserted is formed in a front surface of the chassis sheath, a traverse base 30 is disposed on the side of a front surface of the base body 10, a rear base 13 is disposed on the side of a rear surface of the base body 10, a printed board 14 is provided between the rear base 13 and the base body 10, and a link arm 105 is disposed between the rear base 13 and the printed board 14. The rear base 13 is provided at its portion with an opening 13A, a link arm 105 is formed at its portion with a folded piece 105D, which is folded toward the opening 13A, a space is formed on the side of the printed board 14 by the folded piece 105D, and a part 14A to be mounted on the printed board 14 is disposed in correspondence with the space.