PROBLEM TO BE SOLVED: To provide a porous stretchable film which suppresses occurrence of blocking, has good air permeability, is hardly broken when stretched, and has elasticity that is hardly lowered and a method for producing the same； and a composite sheet.SOLUTION: A porous stretchable film 10 has an elastomer layer containing a thermoplastic elastomer and a surface layer that is provided on one or both of a first surface and a second surface of the elastomer layer and contains a thermoplastic resin, has a plurality of through holes 13 formed therein, and the porous stretchable film 10 alternately has a first region 11 that extends in a plane direction of the porous stretchable film 10 and has a belt shape, and a second region 12 that is adjacent to the first region 11, is more hardly stretched than the first region 11, extends in the plane direction of the porous stretchable film 10, and has a belt shape.SELECTED DRAWING: Figure 2【課題】ブロッキングの発生が抑えられ、通気性がよく、かつ伸長した際に破断しにくく伸縮性が低下しにくい多孔伸縮フィルム、その製造方法および複合シートを提供する。【解決手段】熱可塑性エラストマーを含むエラストマー層と、エラストマー層の第１の面および第２の面のいずれか一方または両方に設けられた、熱可塑性樹脂を含む表面層とを有し、複数の貫通孔１３が形成された多孔伸縮フィルム１０であり、多孔伸縮フィルム１０は、多孔伸縮フィルム１０の面方向に沿って延びる帯状の第１の領域１１と、第１の領域１１に隣接し、第１の領域１１よりも伸長しにくい、多孔伸縮フィルム１０の面方向に沿って延びる帯状の第２の領域１２とを交互に有する。【選択図】図２
