This thermoacoustic device comprises a loop-shaped waveguide and a heat exchanger. The loop-shaped waveguide is filled with a medium. The heat exchanger is provided in the waveguide and includes a low-temperature part, a high-temperature part, and a temperature gradient maintenance part that is provided between the low-temperature part and the high-temperature part and that maintains the temperature gradient generated between the low-temperature part and the high-temperature part. The temperature gradient maintenance part includes a plurality of linear thermal conductors.
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