  We investigate low-energy cosmic-ray antiprotons ($\bar{p}$'s) arising from
the fragmentation of quarks and gluons emitted from evaporating primordial
black holes (PBHs). To calculate the local interstellar flux of these
$\bar{p}$'s, their propagation in the Galaxy is described by a 3-D Monte Carlo
simulation based on the diffusion model. This flux is used with recent
observations to derive new upper limits on (i) the local PBH explosion rate
${\cal R}<1.7\times10^{-2}$ pc$^{-3}$yr$^{-1}$, (ii) the fraction of the
Universe's mass going into PBHs with particular mass, and (iii) the average
density of PBHs in the Universe.
