NOVELTY - A polyimide precursor varnish contains a composition containing a polyimide precursor and a solvent. A polyimide film used as coating film obtained by carrying out coating the composition on a film, and heat treating under a nitrogen atmosphere at 300 degrees C for one hour with the temperature elevation rate of 5 degrees /minute and the film thickness of 20-60 mu m after drying. The polyimide film has a glass transition temperature of 290 degrees C or more, a coefficient of water absorption of 2% or less and a tensile rupture elongation of 55% or more.    USE - Polyimide precursor varnish is used for polyimide resin used as insulation coating material for electronic component e.g. heat-resistant tape, heat-resistant paint and adhesive agent for aerospace (all claimed). Uses include but are not limited to printed wiring boards, motor vehicle, seamless belt for electronic office equipment, heat radiating component, electromagnetic wave shield component, battery binder, component for solar cell, density component, insulation protective material of transparent conductor and insulated wire etc.    ADVANTAGE - The hardened material of the polyimide resin containing the polyimide precursor varnish has excellent insulating property, mechanical characteristics, water absorbability and heat resistance.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) polyimide resin, which is formed by imidating a molding acquired containing the polyimide precursor varnish;    (2) electronic component, which contains the polyimide resin formed when at least one portion of the insulation coating material imidated the molding containing the polyimide precursor varnish, and an electronic component containing the insulation coating material covers the conductor (10);    (3) heat-resistant tape, whish has a support base material containing the polyimide resin as a component, and a joining layer formed on the support base material; and    (4) adhesive agent for aerospace, which contains a gel film containing the polyimide precursor varnish.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of insulated wire.    Insulated wire (1)    Conductor (10)    Insulation coating layer (20)