  Considering a possibility that the pseudogap state in the underdoped
high-$T_{c}$ superconductors is not due to a superconducting correlation, we
study the tunneling spectroscopy below $T_{c}$ based on the phenomenological
models of the pseudogap state. Specifically we consider two cases: (1) the
pseudogap is a simple suppression of the density of states with an unknown
origin; (2) the pseudogap state is due to an antiferromagnetic correlation. For
both cases we calculate $dI/dV$ using the BTK theory. The results are discussed
in comparison with experiments.
