Provided are a film having an excellent balance between heat seal strength and opening strength, a method of producing the film, and a bag obtained by heat-sealing the film. According to the present invention, there is provided a film containing a resin, wherein a resin density of the film is 860 kg/m3 or more and less than 900 kg/m3, and on at least one surface of the film, an arithmetic mean height Sa satisfies the following Expression [1]:0.10 micro m less than or equal to Sa less than or equal to 0.50 micro m [1], and a minimum autocorrelation length Sal satisfies the following Expression [2]:0.2 micro m less than or equal to Sal less than or equal to 10.4 micro m [2].

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