Abstract: It is possible to provide polyimide powder which has an average size of 25 ?m or less and is free from metal impurities which would otherwise be produced due to abrasion of a machine used for mechanical milling. The polyimide powder is an aggregate of fine particles produced through precipitation of polyimide dissolved in a treatment solution containing a basic substance. A residual amount of alkali metal derived from the basic substance contained in the treatment solution is 1% or less of a total amount of the polyimide powder. It is possible to reduce bad effects due to an alkali metal residue and to prevent decomposition of polyimide by the alkali metal residue.