A method for gasification with CO 2 recovery, characterized by comprising: a hydration process for performing a hydration reaction by contact of CaO, which is a CO 2 absorbent, with water vapor while keeping a predetermined pressure and maintaining a temperature at or below an upper limit for production of Ca 2, which is an absorbent hydrate; a water removal process in which Ca 2 produced by the hydration process is introduced to be heated for water removal, thereby obtaining a highly active CaO; a gasification process for producing char through reaction of a raw material with water vapor and for gasifying the char to produce a gasified gas, CO 2 being absorbed by said highly active CaO from said water removal process to produce CaCO 3 which is an absorptive-reaction product, heat of the reaction at this time being utilized for gasification of said raw material, said gasified gas being passed through said water removal process for supply of a heat source for water removal from said Ca 2; an absorbent regeneration process in which, in the presence of the absorptive-reaction product CaCO 3 including the char from said gasification process, a circulation gas including CO 2 and water vapor and oxygen, the absorptive-reaction product CaCO 3 is calcined with heat of combustion of the char for separation into CO 2 and CaO, the resultant CaO being supplied to said hydration process; and a CO 2 recovery process for extracting and recovering a portion of said CO 2 separated by said absorbent regeneration process and circulated to said gasification process and to said absorbent regeneration process; pressure in said water removal process, said gasification process and said absorbent regeneration process being the same as pressure in said hydration process. a hydration process for performing a hydration reaction by contact of CaO, which is a CO 2 absorbent, with water vapor while keeping a predetermined pressure and maintaining a temperature at or below an upper limit for production of Ca 2, which is an absorbent hydrate; a water removal process in which Ca 2 produced by the hydration process is introduced to be heated for water removal, thereby obtaining a highly active CaO; a gasification process for producing char through reaction of a raw material with water vapor and for gasifying the char to produce a gasified gas, CO 2 being absorbed by said highly active CaO from said water removal process to produce CaCO 3 which is an absorptive-reaction product, heat of the reaction at this time being utilized for gasification of said raw material, said gasified gas being passed through said water removal process for supply of a heat source for water removal from said Ca 2; an absorbent regeneration process in which, in the presence of the absorptive-reaction product CaCO 3 including the char from said gasification process, a circulation gas including CO 2 and water vapor and oxygen, the absorptive-reaction product CaCO 3 is calcined with heat of combustion of the char for separation into CO 2 and CaO, the resultant CaO being supplied to said hydration process; and a CO 2 recovery process for extracting and recovering a portion of said CO 2 separated by said absorbent regeneration process and circulated to said gasification process and to said absorbent regeneration process;