Provided are a tetrafluoroethylene copolymer excellent in paste extrudability, which comprises a unit based on tetrafluoroethylene and a unit based on a monomer represented by a formula of CF.sub.2.dbd.CF--O--(CF.sub.2).sub.nCF.dbd.CF.sub.2 (wherein n is an integer of from 1 to 6), wherein a content of the unit based on the monomer represented by the formula is from 0.1 to 0.5% by mass, wherein a particle size of a primary particle is from 0.1 to 0.5 .mu.m, wherein a standard specific gravity is from 2.14 to 2.25, wherein a paste extrusion pressure is from 24.5 to 73.5 MPa and wherein the copolymer remains not undergoing melt molding; a fine powder of a tetrafluoroethylene copolymer; and a production method and a paste extruded product thereof. The TFE copolymer is excellent in paste extrudability and the molded product thereof is excellent in heat resistance and transparency.