Abstract: To provide a polyimide film having an original film width of at least 500 mm, whose isotropy in a width direction is improved to have uniform properties, which polyimide film has been apt to cause property difference in the width direction by continuous molding. The polyimide film has an original film width of at least 500 mm and a thickness of at most 50 ?m, wherein the maximum value of MOR-c is at most 1.35 and a tensile elastic modulus is at least 5.0 GPa at any part of the film.

Abstract: To provide a polyimide film having an original film width of at least 500 mm, whose isotropy in a width direction is improved to have uniform properties, which polyimide film has been apt to cause property difference in the width direction by continuous molding.

Abstract: A polyimide film having sufficiently excellent characteristics such as a sufficiently high elastic modulus, a low water absorption, a small coefficient of moisture-absorption expansion, a small coefficient of linear expansion and a high dimensional stability; and various electric/electronic equipment bases with the use of the polyimide film. A polyimide film having a tensile elastic modulus of 700 kg/mm2 or less and a coefficient of moisture-absorption expansion of 20 ppm or less and containing a specific repeating unit as an essential repeating unit is synthesized. Then various electric/electronic equipment bases such as a laminate for flexible print connection boards are produced by using the polyimide film.