  We present the results of 3 GHz radio continuum observations of the 8 host
galaxies of super-luminous supernovae (SLSNe) at $0.1 < z < 0.3$ by using the
Karl G. Jansky Very Large Array. Four host galaxies are detected significantly,
and two of them are found to have high star-formation rates (SFRs $>$ 20
$M_{\odot}$ yr$^{-1}$) derived from radio emission, making them the most
intensely star-forming host galaxies among SLSN host galaxies. We compare radio
SFRs and optical SFRs, and find that three host galaxies have an excess in
radio SFRs by a factor of $>$2, suggesting the existence of dust-obscured star
formation, which cannot be traced by optical studies. Two of the three host
galaxies, which are located in the galaxy main sequence based on optical SFRs,
are found to be above the main sequence based on their radio SFRs. This
suggests a higher fraction of starburst galaxies in SLSN hosts than estimated
in previous studies. We calculate extinction from the ratio between radio SFRs
and dust-uncorrected optical SFRs and find that the hosts are on the trend of
increasing extinction with metallicity, which is consistent with the relation
in local star-forming galaxies. We also place a constraint on a pulsar-driven
SN model, which predicts quasi-steady synchrotron radio emission.
