To supply a slipper which gives a pressure to a plantar arch point stronger than before, enables the adjustment of strength and weakness, gives a diet effect to a foot, and does not let others know of the diet slipper.

A projection (2) is provided at the shank part of the slipper that has a length from the toe to the heel. The sole is formed of 2 different materials (a hard material at the front (3) and a soft material (4) at the back).