A fuel vapor processing apparatus (30) includes a set plate (15) and a canister (16). The set plate (15) can close an attachment hole (13) of a fuel tank (12). The canister (16) includes three or more adsorption material chambers (41-44; 171-176) each housing therein an adsorption material (58) for removably adsorbing a fuel vapor. Each two adjacent adsorption chambers in communication with each other are connected in series such that an evaporated gas flows in opposite directions.
