TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compounds: The alicyclic tertiary monoamine is piperidine compound of formula (1). The acyl compound (A) is aliphatic and/or alicyclic tetracarboxylic dianhydride having 5-membered ring and/or 6-membered ring acid anhydride structures. The polyimide is manufactured using a dehydrating agent chosen from acid chloride, carboiimide compound, acetic anhydride, propionic anhydride and benzoic anhydride. The imidation process is carried out at 10-120 degrees C. The polyimide has imide group concentration of 2.5-5.5 mmol/g at imidation ratio of 100 mol%, and weight average molecular weight of 50000-500000 based on polystyrene conversion.R=1-4C alkyl;X=oxygen atom or sulfur atom;l=0 or 1;andm,n=0-2.Preferred Components: The component (A) is component (a-1) having imidation ratio of 95% or more. The component (a-1) is a compound having 5-membered ring acid anhydride structure and does not having 6-membered ring acid anhydride structure and cross-linked ring structure, and/or an acyl compound and its reactive derivatives. The component (A) is at least one type of acyl compound chosen from component (a-2), compound (b) having 5-membered ring acid anhydride structure and 6-membered ring acid anhydride structure and their reactive derivatives, and compound (c) having 6-membered ring acid anhydride structure and does not having 5-membered ring acid anhydride structure and their reactive derivatives. The component (a-2) is acyl compound having 5-membered ring acid anhydride structure and cross-linked ring structure and does not having 6-membered ring acid anhydride structure, and their reactive derivatives. The two or more carbon atoms of compound (a-2) cross-links to form cross-linked ring form acid anhydride structure. Preferred Properties: The polyimide film has fracture elongation is 5% or more, and water absorption of less than 5 mass% when immersed at 25 degrees C for 24 hours. The polyimide film having thickness of 20 mu m has yellow index of 2 or less measured by transparency testing method according to JIS K7105.