To further improve the effect of suppressing the spread of fire by enhancing the sealing effect of a heat-expandable member.SOLUTION: A fireproof member 1 includes heat-expandable members 2A and 2B which are arranged at a distance from each other between the inner peripheral surface of a through hole 101 of a partition portion 100 and an outer peripheral surface of a pipe 102 and which are expanded by heat during a fire, and a holding member 5 made of an incombustible material which holds the heat-expandable members 2A and 2B.SELECTED DRAWING: Figure 4

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