To provide a comfortable slipper or sandal to be put on from both front and rear sides, solving a problem of an existing one that a person has to change the direction of the slipper or sandal to put on when the person chances the person's shoes to the slippers or sandals to enter a hospital or a public facility where, in many cases, slippers or sandals are left as they are and not arranged properly.

In the slipper or sandal, a crossing point movable plate is attached to the crossing point of two thongs 21 and 22 so that the crossing point of the thongs is located between two slits. The thongs pierce through the crossing point movable plate on both sides of the crossing point from the slits so that the thongs are connected to the sole of the slipper or sandal.