The aqueous dispersion according to claim 1, wherein the fluorine-containing olefin which is copolymerizable with tetrafluoroethylene in the core is at least one selected from the group consisting of: Y(CF2)x Oy CZ═CF2 wherein Y is a hydrogen atom, a chlorine atom or a fluorine atom, Z is a hydrogen atom or fluorine atom, x is an integer of 1 to 6 and y is 0 or 1, and a compound of the formu