Disclosed is a polyamide acid solution containing a polyamide acid (PAA1), a solvent (C) in which the polyamide acid (PAA1) is dissolved, and a substance (M) capable of discharging metal ions of at least one metal selected from group 1 and group 2 elements of the periodic table or a material (m) containing the substance (M). Also disclosed is a polyimide composite material produced from such a polyamide acid solution. The polyimide composite material is significantly improved in glass transition temperature without deteriorating the intrinsic physical properties of a polyimide itself.