Filler-filled film, sheet film, stacked film, bonded body, and method for producing filler-filled film

A method for producing a filler-filled film, comprising:

• a step of preparing a circular cylindrical or circular columnar master in which a plurality of convexities are formed on a peripheral surface;
• a step of producing a film main body by conveying a long-length transfer destination film by a roll-to-roll system and at the same time transferring a shape of the peripheral surface of the master to the transfer destination film;
• and
• a step of putting a filler in a plurality of concavities formed on a surface of the film main body,
• wherein a diameter of an opening surface of the concavity is at least larger than a visible light wavelength, and
• the difference between the rate of filling of the fillers in one end portion of the film main body and the rate of filling of the fillers in another portion of the film main body is less than 0.5%.