To provide a disk apparatus including a disk guide for guiding movement of a disk in a disk insertion direction; wherein the disk guide includes a platy guide member, a convex portion provided in vicinity of opposite ends of a platy guide member, and an engagement portion disposed on the same surface as the convex portion of the guide member. By engaging and fixing the engagement portion to a platy disk guide fixing member, which is disposed in a chassis of the disk apparatus, and bringing into contact with the convex portion on this platy disk guide fixing member, the disk guide is inclined in a direction far from the disk fixing member with an inclined angle increased from the center part of the guide member toward respective ends and the disk guide brings into contact with only an outer circumferential portion of the disk in inserting.