Porous polyimide film and a production method thereof

The present invention has a high porosity and a small average pore diameter, and to provide a porous polyimide film porogen like do not remain, and a manufacturing method thereof. The porous polyimide film of the present invention comprises a polyimide containing oxyalkylene units, porosity 45% by volume or more and less 95% by volume and an average pore diameter of 10nm or more, and wherein the at 1000nm or less.