PROBLEM TO BE SOLVED: To provide a stretchable film which suppresses occurrence of blocking and has good elasticity and a method for producing the same； and a composite sheet.SOLUTION: A stretchable film 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, and alternately has a first region 11 that extends in a plane direction of the stretchable film, has elongation magnification of 1.51-5.00 times 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 stretchable film, has elongation magnification of 1.01-1.50 times and has a belt shape.SELECTED DRAWING: Figure 2
