MIDSOLE HAVING LAMINATE STRUCTURE

PROBLEM TO BE SOLVED: To improve functions of a midsole.SOLUTION: A first foam N and a second foam S have different mechanical properties from each other. In any one region of a forefoot part 1F, a middle foot part 1M, and a heel part 1R, a thickness of the first foam N on an inner side M of a foot is different from that on an outer side L. In the region in which the first foam N has different thicknesses, a thickness of the second foam S on an inner side part SM is different from that on an outer side part SL, the inner side part SM and outer side part SL supporting a rear side of the foot. Between the inner side part SM and outer side part SL in an upper layer 2, a taper part ST is arranged which changes in thickness as extended from the inner side M to the outer side L. A change degree of the thickness in the taper part ST is larger than that in the inner side part SM or that in the outer side part SL.SELECTED DRAWING: Figure 4 【課題】本発明の目的はミッドソールの機能を向上させることである。【解決手段】第１発泡体Ｎと第２発泡体Ｓとは互いに機械的性質が異なり、前足部１Ｆ、中足部１Ｍ、後足部１Ｒの領域のうちいずれか１つにおいて、前記第１発泡体Ｎの厚さが足の内側Ｍと外側Ｌとで異なっており、かつ、前記第１発泡体Ｎの厚さの異なっている前記領域において第２発泡体Ｓの厚さが足の裏側を支える内側部ＳＭと外側部ＳＬで異なっており、上層２における内側部ＳＭと外側部ＳＬとの間には、内側Ｍから外側Ｌに延びるに従い厚さの変化するテーパ部ＳＴが設けられ、前記テーパ部ＳＴの厚さの変化の度合が前記内側部ＳＭの厚さの変化の度合、あるいは、前記外側部ＳＬの厚さの変化の度合いよりも大きい。【選択図】図４