In order to consider the effect of sprinkler systems and to reduce the amount of workload in the verification for evacuation safety in fire room, the specifications of a room that ordinary detail verification is not needed to be applied were determined based on framework of risk-based design method for evacuation safety in building fire. In this papa, the maximum value of room floor area to omit the ordinary verification was derived from the rate of hazardous fire occurrence and the density of occupant load. Even in case of a room which has larger floor area than the above value, the evacuation distance and width of the door to omit the ordinary verification for room evacuation were calculated according to the value of the acceptable evacuation risk. In a small room, the effect of the sprinkler system was not taken into consideration since the sprinkler system would not activate before completion of evacuation.%リスクの概念に基づく避難安全設計法の考え方に基づき、小規模居室を対象とした居室避難の検証免除面積の検討、SP設備が設置されていない室及びSP設備が設置されている室のそれぞれの条件について、親室率に応じた煙に曝されずに避難可能な限界歩行距離及び必要出口幅の「簡易検証」の検討を行い、事務所用途に適用した結果、以下の傾向が明らかとなった。
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