  We study the pseudo-spin of electron pair in superconducting transition-metal
dichalcogenide monolayers and show that the pseudo-spin affects the electric
transport property of lateral heterojunction of the superconducting and
metallic monolayers. The pseudo-spins of two electrons forming a Cooper pair
are parallel to each other unlike the real spins being anti-parallel. In the
lateral heterojunction, the electronic transport with forming a Cooper pair,
the Andreev reflection, is suppressed with the Fermi level crossing the valence
band near the edge in the metallic monolayer. We numerically investigate the
electric transport property of the lateral heterojunctions of semiconducting
and superconducting transition-metal dichalcogenides, MoSe$_2$ monolayer and
NbSe$_2$ monolayer with the charge doping, respectively. We find the sign
change of conductance difference between the normal and superconducting phases
by varying the charge density and show that the sign change is resulted from
the pseudo-spin triplet superconductivity.
