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Following a new microlensing constraint on primordial black holes (PBHs) with 10^20--10^28 g H. Niikura et al. , arXiv: 1701. 02151. , we revisit the idea of PBH as all dark matter (DM). We have shown that the updated observational constraints suggest the viable mass function for PBHs as all DM to have a peak at 10^20 g with a small width 0. 1, by imposing observational constraints on an extended mass function in a proper way. We have also provided an inflation model that successfully generates PBHs as all DM fulfilling this requirement.
Inomata et al. (Mon,) studied this question.