Provided is a magnetic tape device including: a magnetic head having a magnetic element that acts on a magnetic layer formed on a front surface of a magnetic tape; and a guide member that is disposed at a position facing the magnetic head via the magnetic tape and guides the magnetic tape to the magnetic head, in which a back surface of the magnetic tape, which is provided on a side opposite to the front surface and is a surface coarser than the front surface, is slid on the guide member.

Provided is a magnetic tape device including: a magnetic head having a magnetic element that acts on a magnetic layer formed on a front surface of a magnetic tape; and a guide member that is disposed at a position facing the magnetic head via the magnetic tape and guides the magnetic tape to the magnetic head, in which a back surface of the magnetic tape, which is provided on a side opposite to the front surface and is a surface coarser than the front surface, is slid on the guide member.