Provided is a film letting-off device for a rolled bale V, which is arranged immediately upstream of a roll baling device B for covering and wrapping the outer circumference of the rolled bale V with a film F, for letting off said film F. A width reducing device H, which is constituted such that a pair of width reducing rollers 96 arranged in the widthwise direction of the film F so as to reduce the width of the film F being let off from a film rolling device E, while said rolled bale V is being covered with the film F, are brought close to and apart from each other while being centered, is arranged between said film rolling device E and said drive roller device D.