A stabilizer includes a midsole, and a counter placed in a rearfoot portion of the midsole, the counter including a counter body attached to a surface of the rearfoot portion of the upper, and at least one skirt extending downward from the counter body and covering, and attached to, a side surface of the rearfoot portion of the midsole on a medial side or a lateral side, the at least one skirt including a posterior end placed on the side surface or a back surface of the midsole, and an exposed portion where the skirt is absent and the midsole is exposed is provided in at least a portion in a circumferential direction of the back surface of the midsole.