Provided is a thin film battery, including: a base substrate; a cathode current collector pattern and an anode current collector pattern being formed on the base substrate and being electrically separate from each other; a cathode terminal and an anode terminal being directly bonded with the cathode current collector pattern and the anode current collector pattern; a cathode and an anode being disposed on the cathode current collector pattern and the anode current collector pattern; and an electrolyte layer being disposed between the cathode and the anode.