Provided is a laundry treating apparatus including a drum, a circular guide, and a panel. The drum holds laundry, has a front side and a rear side opened, and has a cross-section of a noncircular looped curve in which a distance from a rotation center is not uniform. The circular guide rotatably supports a portion of the drum in which a section curvature is uniform. The panel is provided on a front side or a rear side of the drum and supports the circular guide such that the circular guide is rotatable.