Several isomers in ${}^{188}\mathrm{Pb}$ have been identified using pulsed beams, the recoil-shadow technique, and the ${}^{164}\mathrm{Er}{(}^{28}\mathrm{Si}{,4n)}^{188}\mathrm{Pb}$ reaction. Two of the isomers feed the ${10}^{+}$ state of the yrast sequence and are suggested to be the ${11}^{\ensuremath{-}}$ and ${12}^{+}$ states from oblate and spherical configurations, respectively. The ${12}^{+}$ isomer is fed weakly by another isomer with a relatively long lifetime, but it has not been characterized. A fourth isomer with a lifetime of about $1.2 \ensuremath{\mu}\mathrm{s}$ leads via a complicated path to the ${8}^{+}$ and lower spin yrast states. It is a candidate for the ${K}^{\ensuremath{\pi}}{=8}^{\ensuremath{-}},$ two-quasineutron state which occurs systematically in $N=106$ prolate-deformed nuclei, supporting the assumption that the intruding collective well is prolate.