A method of storing and transporting gas wherein a large amount of gas is stored and transported by bringing the gas into contact with a porous material having fine pores and a large specific surface area in the presence of a compound serving as host at or close to room temperature. The method according to the invention enables the gas in an amount equivalent to more than 180 times as much as an unit volume of the porous material to be stored or transported in a short time even under low pressure, for example, the atmospheric pressure or up to 10.68 atm (equivalent to 10 kg / cm 2 by gauge pressure) or less, and furthermore, is applicable to various kinds of gases.