  Passive spiral galaxies -- unusual galaxies with spiral morphology without
any sign of on-going star formation -- have recently been discovered to exist
preferentially in cluster infalling regions (at about the virial radius, or at
a local galaxy density of $\sim 1$ Mpc$^{-2}$). The discovery directly connects
the passive spiral galaxies to the cluster galaxy evolution studies such as the
Butcher-Oemler effect or the morphology-density relation, i.e., passive spiral
galaxies are likely to be transition objects between high-z blue, spiral
galaxies and low-z red, cluster early-type galaxies. Thus, detailed study of
passive spiral galaxies potentially could bring a new insight on the underlying
physical mechanisms governing cluster galaxy evolution. However, in previous
work, passive spiral galaxies are selected from the low resolution optical
images with $\sim 1.5$ arcsec of seeing. Therefore, passive spirals could be a
mis-identification of S0 galaxies; or dusty-starburst galaxies which are not
passive at all. To answer these questions, we performed a deep,
high-resolution, near-infrared imaging of 32 passive spiral galaxies. Our high
resolution $K$ band images show clear spiral arm structures. Thus, passive
spirals are not S0s. Optical-infrared colour does not show any signs of
dusty-starburst at all. Therefore, it is likely that they are truly ``passive''
and ``spiral'' galaxies in the midst of cluster galaxy evolution.
