We investigate the Q-ball decay into the axino dark matter in thegauge-mediated supersymmetry breaking. In our scenario, the Q ball decaysmainly into nucleons and partially into axinos to account for the baryonasymmetry and the dark matter of the universe simultaneously. The Q ball decayswell before the big bang nucleosynthesis so that it is not affected by thedecay. The decay into the supersymmetric particles of the minimalsupersymmetric standard model is kinematically prohibited until the very end ofthe decay, and we could safely make their abundances small enough for thesuccessful big bang nucleosynthesis. We show the regions of axino modelparameters and the Q-ball parameters which realize this scenario.
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