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We observed a distinct peak in the $\Lambda p$ invariant mass spectrum of$^{3}{\rm He}(K^-, \, \Lambda p)n$, well below the mass threshold of $m_K + 2m_p$. By selecting a relatively large momentum-transfer region $q = 350 \sim650$ MeV/$c$, one can clearly separate the peak from the quasi-free process,$\overline{K}N \rightarrow \overline{K}N$ followed by the non-resonantabsorption by the two spectator-nucleons $\overline{K}NN \rightarrow \Lambda N$. We found that the simplest fit to the observed peak gives us a Breit-Wignerpole position at $B_{\rm {\it Kpp}} = 47 \pm 3 \, (stat.) \,^{+3}_{-6}\,(sys.)$ MeV having a width $\Gamma_{\rm {\it Kpp}} = 115 \pm 7 \, (stat.)\,^{+10}_{-9} \,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factorparameter $Q_{\rm {\it Kpp}} = 381 \pm 14 \, (stat.)\,^{+57}_{-0} \,(sys.)$MeV/$c$, as a new form of the nuclear bound system with strangeness --"$K^-pp$".

"$\mathbf{{\textit K^-}{\textit p}{\textit p}}$", a  ${\overline{K}}$-Meson Nuclear Bound State, Observed in $^{3}{\rm He}({K^-},  {\Lambda} p)n$ Reactions