A gas separation and recovery method for separating and recovering a target gas component from a source gas by pressure swing adsorption, comprising: an adsorption step of causing gas components to adsorb to an adsorbent packed in an adsorbent vessel, and a desorption step of desorbing the gas components adsorbed to the adsorbent in the adsorption step and recovering the desorbed gases, wherein the method does not include a rinse step in which part of desorbed gas from other adsorbent vessel is supplied as a rinse gas, and the desorption step is divided into a plurality of time periods and the desorbed gases are recovered in the respective time periods, wherein (A) the adsorbent vessel is connected to a pressure release valve for reducing the pressure inside the vessel, and the pressure release valve is opened to reduce the pressure inside the adsorbent vessel before the adsorbent vessel is evacuated with a vacuum pump in the desorption step; and/or (B) the desorption step is performed in such a manner that the adsorbent vessel is evacuated with a vacuum pump to desorb a gas or gases in one or more time periods from the start of the step, and thereafter a purge gas is introduced into the adsorbent vessel to desorb a gas or gases without use of the vacuum pump in the subsequent time period or periods. an adsorption step of causing gas components to adsorb to an adsorbent packed in an adsorbent vessel, and a desorption step of desorbing the gas components adsorbed to the adsorbent in the adsorption step and recovering the desorbed gases, wherein the method does not include a rinse step in which part of desorbed gas from other adsorbent vessel is supplied as a rinse gas, and the desorption step is divided into a plurality of time periods and the desorbed gases are recovered in the respective time periods, wherein (A) the adsorbent vessel is connected to a pressure release valve for reducing the pressure inside the vessel, and the pressure release valve is opened to reduce the pressure inside the adsorbent vessel before the adsorbent vessel is evacuated with a vacuum pump in the desorption step; and/or (B) the desorption step is performed in such a manner that the adsorbent vessel is evacuated with a vacuum pump to desorb a gas or gases in one or more time periods from the start of the step, and thereafter a purge gas is introduced into the adsorbent vessel to desorb a gas or gases without use of the vacuum pump in the subsequent time period or periods. (A) the adsorbent vessel is connected to a pressure release valve for reducing the pressure inside the vessel, and the pressure release valve is opened to reduce the pressure inside the adsorbent vessel before the adsorbent vessel is evacuated with a vacuum pump in the desorption step; and/or the adsorbent vessel is connected to a pressure release valve for reducing the pressure inside the vessel, and the pressure release valve is opened to reduce the pressure inside the adsorbent vessel before the adsorbent vessel is evacuated with a vacuum pump in the desorption step; and/or (B) the desorption step is performed in such a manner that the adsorbent vessel is evacuated with a vacuum pump to desorb a gas or gases in one or more time periods from the start of the step, and thereafter a purge gas is introduced into the adsorbent vessel to desorb a gas or gases without use of the vacuum pump in the subsequent time period or periods. <EOS>