A carbon dioxide gas absorbent includes a porous body containing a lithium complex oxide. The porous body includes pores having a pore diameter distribution such that main pores which consist of first pores with a diameter of 10 to 100 .mu.m and second pores with a diameter larger than 100 .mu.m and 500 .mu.m or smaller occupy 80 to 100%, third pores with a diameter smaller than 10 .mu.m occupy 0 to 10% and fourth pores with a diameter larger than 500 .mu.m occupy 0 to 10%, the main pores have a pore diameter distribution such that the first pores occupy 15 to 85% and second pores occupy 15 to 85%.

 
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