An insurance premium rate setting support system is composed of a computer and includes: a probability-increase/strong-influence location coefficient setting section which sets a probability-increase/strong-influence location coefficient by obtaining the coefficient based on a predetermined function; and an earthquake insurance premium rate computation section which computes an insurance premium rate where an increase in the earthquake occurrence probability, based on the estimated strain accumulation, is reflected by multiplying together the set probability-increase/strong-influence location coefficient and an insurance premium rate where the increase in the earthquake occurrence probability, based on the estimated strain accumulation, is not reflected.