Sole

Abstract

A boundary portion located between an upper and a midsole in a foot width direction includes a first boundary portion. The first boundary portion is positioned at a portion of the sole corresponding to a lateral side of the wearer's forefoot. An expansion portion is positioned at a portion of the midsole corresponding to the lateral side of the wearer's forefoot. The expansion portion bulges from the first boundary portion toward the lateral side of the sole with respect to the first boundary portion in the foot width direction. An outsole has a roll-up portion protruding upward from a peripheral edge portion of an upper surface of the outsole. The roll-up portion is located at a portion corresponding to the expansion portion of the midsole and covers a peripheral edge portion of the expansion portion from the outside.

What is claimed is: 
     
         1 . A sole for a shoe including an upper, the sole comprising:
 a midsole; and an outsole stacked on a lower side of the midsole and made of a material having a higher rigidity than that of the midsole,   with the upper attached to the midsole, the midsole being provided with a boundary portion located between the upper and the midsole in a foot width direction,   the boundary portion including a first boundary portion positioned at a portion of the sole corresponding to a lateral side of a forefoot of a wearer's foot,   the midsole having an expansion portion positioned at a portion of the sole corresponding to the lateral side of the forefoot of the wearer's foot,   the expansion portion bulging from the first boundary portion toward the lateral side of the sole with respect to the first boundary portion in the foot width direction,   the outsole having a roll-up portion protruding upward from a peripheral edge portion of an upper surface of the outsole,   the roll-up portion being located at a portion corresponding to the expansion portion of the midsole, the roll-up portion covering a peripheral edge portion of the expansion portion from an outside.   
     
     
         2 . The sole of  claim 1 , wherein
 the expansion portion is positioned at least on a lateral side of a portion of the midsole corresponding to a ball of the little toe of the wearer's foot.   
     
     
         3 . The sole of  claim 1 , wherein
 a maximum dimension of the expansion portion in the foot width direction is a length equal to or greater than a dimension of the ball of the little toe of the wearer's foot in the foot width direction.   
     
     
         4 . The sole of  claim 1 , wherein
 a dimension of the expansion portion in the foot width direction is a length of 10 mm or more.   
     
     
         5 . The sole of  claim 1 , wherein
 a height of the roll-up portion in an upper-lower direction at a position corresponding to part of the midsole corresponding to a lateral side of a metatarsophalangeal joint of the wearer's foot is equal to or greater than half a distance between a lower surface of the outsole and an upper surface of the midsole.   
     
     
         6 . The sole of  claim 1 , wherein
 a height of the roll-up portion in an upper-lower direction at a position corresponding to part of the midsole corresponding to a lateral side of a metatarsophalangeal joint of the wearer's foot is 12 mm or more.   
     
     
         7 . The sole of  claim 1 , wherein
 a thickness of at least part of a region of the midsole corresponding to a wearer's toe is greater than a thickness of a region of the midsole corresponding to a wearer's metatarsophalangeal joint.