Abstract: A rack structure for a rack assembly includes: a base shaft including a first end surface, an opposite second end surface, an inserting recess recessed from the first end surface to the second end surface, an connecting surface located between the first and second end surfaces, and at least three connecting portions which are mounted on the connecting surface and inclined from the first end surface to the second end surface; and at least three connecting arms each including: a jointing portion formed at one end thereof and to be connected to the connecting potion, a support portion formed at another end opposite the jointing portion, and a plurality of hanging holes defined between the jointing portion and the support portion, wherein an extension plane of the second end surface is located between the support portion and the first end surface.