Abstract: A fire extinguishing device having a fire extinguishing agent and a fire extinguishing capsule is provided. The fire extinguishing device includes a base portion having an internal space in a form of a capsule and a fire extinguishing agent located inside the base portion and configured to extinguish a flame, wherein the base portion is formed to be in contact with a target object, the fire extinguishing agent vaporizes at a determined temperature or higher according to heat generation or ignition of the base portion, a contact area between the base portion and the target object increases as the base portion expands, and the base portion is configured to, in a case of a fire or explosion of the target object, be destroyed together and the fire extinguishing agent is dispersed in a direction of the target object.