  We present results of $^{12}$CO(J = 1-0) imaging observations of NGC
4567/4568, a galaxy pair in a close encounter, with Atacama Large
Millimetre/submillimetre Array. For the first time, we find clear evidence of a
molecular collision front whose velocity dispersion is 16.8$\pm$1.4 km s$^{-1}$
at the overlapping region owing to high spatial and velocity resolution. By
integrating over the velocity width that corresponds to the molecular collision
front, we find a long filamentary structure with a size of 1800 pc $\times$ 350
pc at the collision front. This filamentary molecular structure spatially
coincides with a dark-lane seen in R-band image. We find four molecular clouds
in the filament, each with a radius of 30 pc and mass of 10$^{6} M_{\odot}$;
the radii matching a typical value for giant molecular clouds and the masses
corresponding to those between giant molecular clouds and giant molecular
associations. All four clouds are gravitationally bound. The molecular
filamentary structure and its physical conditions are similar to the structure
expected via numerical simulation. The filament could be a progenitor of super
star clusters.
