  We report on our searches for debris disks around seven relatively nearby
radio pulsars, which are isolated sources and were carefully selected as the
targets on the basis of our deep $K_s$-band imaging survey. The $K_s$ images
obtained with the 6.5\,m Baade Magellan Telescope at Las Campanas Observatory
are analyzed together with the \textit{Spitzer}/IRAC images at 4.5 and
8.0~$\mu$m and the \textit{WISE} images at 3.4, 4.6, 12 and 22~$\mu$m. No
infrared (IR) counterparts of these pulsars are found, with flux upper limits
of $\sim \mu$Jy at near-infrared ($\lambda<10\ \mu$m) and
$\sim$10--1000\,$\mu$Jy at mid-infrared wavelengths ($\lambda>10\ \mu$m). The
results of this search are discussed in terms of the efficiency of converting
the pulsar spin-down energy to thermal energy and X-ray heating of debris
disks, with comparison made to the two magnetars 4U~0142+61 and 1E~2259+586
which are suggested to harbor a debris disk.
