PURPOSE: To effectively eliminate moisture in the footwear and prevent the occurrence of malodor, athlete's foot or the like by providing a pump having an air circulating function in the footwear.

CONSTITUTION: When this footwear is worn and the body weight is applied, a pump 3 is pushed up, air passes a pipe 5 and is sprayed through a hole 6. When the footwear is separated from the ground, air enters the pump 3 through a pipe 1 and a valve 2. As a result, air circulation is forcibly generated in the footwear, the healthy and sanitary environment can be maintained, and hotness/stuffiness is prevented. The heel of a foot invariably rests on the soft bottom, thus the fatigue in walking is mitigated.