  We investigate the observational constraints on the inhomogeneous big-bang
nucleosynthesis that Matsuura et al. suggested the possibility of the heavy
element production beyond ${}^7$Li in the early universe. From the
observational constraints on light elements of ${}^4$He and D, possible regions
are found on the plane of the volume fraction of the high density region
against the ratio between high-and low-density regions. In these allowed
regions, we have confirmed that the heavy elements beyond Ni can be produced
appreciably, where $p$- and/or $r$-process elements are produced well
simultaneously.
