To provide a power generating device that generates a large electromotive force using inexpensive and safe magnetic powder and can be used in states other than a raised state.
A power generating device includes: a cylindrical body 2 constructed so as to be able to be hermetically sealed; a coil 3 provided on an outer peripheral portion of the cylindrical body 2; and a permanent magnet 4 provided outside the coil 3. A mixture 5 obtained by mixing magnetic powder 51 with a liquid or another nonmagnetic powder is sealed inside the cylindrical body 2 so that a space is formed therein, and thereby the mixture 5 is allowed to move inside the cylindrical body 2, the magnetic powder 51 preferably having a diameter of 10-100 μm, inclusive, and being not magnetized. Alternatively, as a liquid like this, by using a liquid containing a surfactant and a defoaming agent, the magnetic powder is non-aggregated and allowed to move inside the cylindrical body 2.
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