To provide a manufacturing method of a PTFE which shows melt viscosity characteristics suitable for molding at a melting point or above.

The method consists in producing a branched polytetrafluoroethylene by polymerizing tetrafluoroethylene monomer in a reaction system which contains, as a branch accelerating comonomer, a perfluorovinyl monomer having a fluorine atom to be liberated easily in the molecule and contains a chain transfer agent as a molecular weight regulating agent for regulating length of the branched chain.