To provide a fire extinguishing agent which satisfies fire-extinguishing performance such as speediness of fire extinguishment, flame resistance, durability concerning contamination of liquid dangerous substances, re-ignition preventing property required by ISO 7203.

The fire extinguishing agent contains a surfactant containing polycyclic aromatic condensation hydrocarbon of 9 to 14 carbon number such as naphthalene as essential components, and is useful for an enhancement solution, a synthetic surfactant foam fire extinguishing agent, an aqueous film forming foam fire extinguishing agent, a water soluble polymer adding type fluorine-based foam fire extinguishing agent, a fluorine-based synthetic surfactant adding type protein foam fire extinguishing agent, etc. Moreover, the fire extinguishing agent contains the fluorine-based surfactant.

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