NOVELTY - A coating liquid essentially containing organometallic compound (A), is coated on substrate, and obtained coating film is dried to form dry coating film. The obtained dry coating film is baked to form inorganic film as low-refractive-index transparent conductive film. The inorganic film essentially contains metal oxide as inorganic component. The organometallic compound is organic indium compound, organic tin compound and/or organo zinc compound. The metal oxide is indium oxide, tin oxide and/or zinc oxide.    USE - Manufacture of low-refractive-index transparent conductive film used for low-refractive-index transparent electroconductive substrate for device e.g. display device, light-emitting device electric power generation device and input device (all claimed). Uses include but are not limited to electroluminescent lamp, field emission lamp, solar cell, liquid crystal display, electroluminescent display, electronic paper element, plasma display and touch panel.    ADVANTAGE - The method efficiently provides low-refractive-index transparent conductive film having excellent transparency, electroconductivity and film flatness.    DETAILED DESCRIPTION - A coating liquid essentially containing an organometallic compound (A), is coated on a heat-resistant substrate, and obtained coating film is dried to form dry coating film. The obtained dry coating film is baked to form inorganic film as low-refractive-index transparent conductive film. The inorganic film essentially contains metal oxide as inorganic component. The baking process involves heating the dry coating film under oxygen-containing atmosphere having dew point of more than -10 degrees C at more than calcination temperature in which inorganic component is crystallized, forming an electroconductive oxide fine particle layer having low refractive index, and removing organic component contained in dry coating film by thermal decomposition or combustion process. Gap exists between electroconductive oxide fine particles, during formation of electroconductive oxide fine particle layer. The organometallic compound is organic indium compound, organic tin compound and/or organo zinc compound. The metal oxide is indium oxide, tin oxide and/or zinc oxide. INDEPENDENT CLAIMS are included for the following:    (1) low-refractive-index transparent conductive film, which has refractive index of 1.5-1.65;    (2) low-refractive-index transparent electroconductive substrate, which has low-refractive-index transparent conductive film on substrate; and    (3) device, which has a transparent electrode having low-refractive-index transparent electroconductive substrate.