A metal detection device is capable of effectively detecting a metal mixed in food or the like by generating AC magnetic field simultaneously tuned to respective frequencies by a single transmission coil in response to frequency components of different frequencies without switching an element by a switch or the like. Constituent elements constituting magnetic field generation portion are connected so that a transmission coil L1 and a capacitor C1 resonate in the first frequency F1. Moreover, constituent elements are connected so that the transmission coil L1 and a capacitor C2 resonate in the second frequency F2. Furthermore, constituent elements function so as to effectively separate the capacitor C1 and capacitor C2 so that they do not interfere at least in the same frequency.