Fuel adsorption device and evaporated fuel processing apparatus including the same

An evaporated fuel processing apparatus, comprising:

• a main canister configured to adsorb and desorb evaporated fuel from a fuel tank of a vehicle;
• a buffer canister in communication with the main canister, the buffer canister configured to adsorb and desorb evaporated fuel from the main canister;
• the buffer canister including a fuel adsorption device;
• the fuel adsorption device including:
• a heater;
• a case composed of a metal and having a multi-cylindrical shape, the case accommodating a plurality of adsorbents configured to at least one of adsorb and desorb evaporated fuel;
• the case including a cylindrical first wall part, at least one cylindrical second wall part disposed further inward than the first wall part, and a plurality of connection parts connecting the first wall part and the at least one second wall part to one other;
• wherein a first adsorbent of the plurality of adsorbents is arranged in a first space disposed between the first wall part and the second wall part, and a second adsorbent of the plurality of adsorbents is arranged in a second space disposed further inward than the second wall part;
• and
• wherein the heater is disposed on an outer surface of the first wall part.