Abstract: [Object(s)] To provide an adsorbent which achieves a low-emission performance while maintaining the adsorption performance for adsorbing an evaporated fuel component, a canister comprising the adsorbent, and a method for reducing evaporated fuel emission. [Means to Solve the Problems] A second adsorbent (e.g., a granule) filled in a second compartment disposed in a downstream side with respect to a first compartment comprises an activated carbon as an adsorption site and a solid diluent as a non-adsorption site. The adsorbent has a difference in n-butane adsorption volume of not less than 35 g/L between a n-butane vapor concentration of 5% by volume and a n-butane vapor concentration of 50% by volume measured at 25° C., a butane working capacity measured in accordance with ASTM D5228 of not less than 8 g/dL, and a butane desorption rate of not less than 45% when a purge air amount measured in accordance with ASTM D5228 is 30 bed volumes of the adsorbent volume.