To provide a thermal acoustic energy generation device capable of improving energy efficiency by changing its use mode.

This thermal acoustic energy generation device 20 has a columnar pipe 21 sealed with a working fluid, a heat accumulator 25 arranged in the columnar pipe 21, a high temperature heat exchanger 26, a low temperature heat exchanger 27, a power generation oscillating device 24 for generating a sound wave by vibrating the working fluid in the columnar pipe 21, and a resonance part 23. The resonance part 23 is communicated with the heat accumulator 25 via the high temperature heat exchanger 26 in an engine mode of generating thermal acoustic self-excited vibration of the working fluid by forming a temperature gradient between both end parts of the heat accumulator 25, and is communicated with the heat accumulator 25 via the low temperature heat exchanger 27 in a heat pump mode of moving heat to the high temperature heat exchanger 26 from the low temperature heat exchanger 27 via the heat accumulator 25 by the sound wave generated by the power generation oscillating device 24.