A compressed air energy storage power generation device comprising: an electric motor to be driven by electric power generated by renewable energy; a compressor configured to be driven by the electric motor and to compress air; a pressure accumulator configured to store compressed air compressed by the compressor; an expander to be driven by the compressed air to be supplied from the pressure accumulator; a generator mechanically connected to the expander; a first heat exchanger configured to perform heat exchange between the compressed air to be supplied from the compressor to the pressure accumulator and a first heating medium to cool the compressed air and to heat the first heating medium; a first heat storage configured to store the first heating medium heated by the first heat exchanger; and a second heat exchanger configured to perform heat exchange between the compressed air to be supplied from the pressure accumulator to the expander and the first heating medium to be supplied from the first heat storage to heat the compressed air and to cool the first heating medium; characterized in that the compressed air energy storage power generation device further comprises: a third heat exchanger configured to perform heat exchange between air exhausted from the expander to the atmosphere and a second heating medium to heat the air and to cool the second heating medium; and a fourth heat exchanger (40a, 40b) configured to perform heat exchange between the second heating medium cooled by the third heat exchanger and at least one of lubricating oil to be supplied to the compressor and the first heating medium to be supplied to the first heat exchanger to heat the second heating medium and to cool the lubricating oil and/or the first heating medium. an electric motor to be driven by electric power generated by renewable energy; a compressor configured to be driven by the electric motor and to compress air; a pressure accumulator configured to store compressed air compressed by the compressor; an expander to be driven by the compressed air to be supplied from the pressure accumulator; a generator mechanically connected to the expander; a first heat exchanger configured to perform heat exchange between the compressed air to be supplied from the compressor to the pressure accumulator and a first heating medium to cool the compressed air and to heat the first heating medium; a first heat storage configured to store the first heating medium heated by the first heat exchanger; and a second heat exchanger configured to perform heat exchange between the compressed air to be supplied from the pressure accumulator to the expander and the first heating medium to be supplied from the first heat storage to heat the compressed air and to cool the first heating medium; a third heat exchanger configured to perform heat exchange between air exhausted from the expander to the atmosphere and a second heating medium to heat the air and to cool the second heating medium; and a fourth heat exchanger (40a, 40b) configured to perform heat exchange between the second heating medium cooled by the third heat exchanger and at least one of lubricating oil to be supplied to the compressor and the first heating medium to be supplied to the first heat exchanger to heat the second heating medium and to cool the lubricating oil and/or the first heating medium.