An atomizer and an electronic cigarette are provided. The atomizer according to the present application is configured to form an electronic cigarette in combination with a battery assembly, and the atomizer includes a suction nozzle cap, a liquid storage core, a heating wire, an electronic wire A of a heating wire, an electronic wire B of the heating wire, an atomizing sleeve, an elastic insulating sleeve, an outer electrode, and an inner electrode. The electronic wire A of the heating wire has one end connected to one end of the heating wire, and another end clamped between the suction nozzle cap and the atomizing sleeve. The electronic wire B of the heating wire has one end connected to another end of the heating wire, and another end clamped between the elastic insulating sleeve and the inner electrode.