A canister structure comprising: a canister 28 in which activated carbon 44 is accommodated, the activated carbon 44 being for adsorbing evaporated fuel produced in a fuel tank; an atmosphere vent tube 30 connected to the canister28, the atmosphere vent tube 30 introducing air into the canister 28 and causing evaporated fuel adsorbed by the activated carbon 44 to be desorbed when a negative pressure acts in the canister 28; and a fuel pump controller 46 disposed in the canister28, the fuel pump controller 46 controlling flow rates of fuel being supplied from the fuel tank to an engine, and the fuel pump controller 46 generating heat due to being operated.