A multi layer film 1, wherein a temperature at which the acid modified polyethylene resin has a crystallinity of 60%, Tmα60, is lower than a temperature at which the crystalline polyethylene resin has {HEAD ~ a crystallinity} of {TAIL ~ 80%}, Tmβ80 
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A multi layer film 1 , wherein a temperature at which the acid modified polyethylene resin has a crystallinity of 60 % , Tmα60 , is lower than a temperature at which the crystalline polyethylene resin has { HEAD ~ a crystallinity } of { TAIL ~ 80 % } , Tmβ80
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