An carbon molecular sieve for adsorbing water molecules in an alcohol solution to separate an alcohol from the water molecules, wherein the total volume of pores with an inlet diameter of 0.33 nm or more as determined by a molecular probe method is not less than 3 times the total volume of pores with an inlet diameter of 0.46 nm or more. This carbon molecular sieve is an alcohol concentration material that is capable of efficiently concentrating alcohol without performing a distillation step and that is easily reusable.