  In Jupiter's stratosphere, gaseous carbon monosulfide (CS) was first
discovered in 1994 by millimeter and ultraviolet observations as a product
induced by the collision of comet Shoemaker-Levy 9 (SL9). {To constrain sulfur
chemistry, in 2013, 19 years after the SL9 event, we observed Jupiter's
stratospheric CS $J$=7 -- 6 rotational transition at 0.8 mm wavelength by using
the Atacama Submillimeter Telescope Experiment (ASTE) 10-m single dish
telescope. The CS molecular line was successfully detected with 120 mK
intensity in the antenna temperature scale. The obtained CS total mass shows
$\sim$90$\%$ decrease relative to that observed in 1998. From the line shape
analysis, CS is suggested to be present above the 0.2$^{+0.4}_{-0.15}$ mbar
pressure level, which is comparable to that of determined in 1998 which was
provided by SL9 along with CS, was observed up to the 2.0 mbar pressure region.
The discrepancy of CS vertical distribution with \ce{H2O} and the decrease in
its total mass may be attributed to the chemical loss of CS in Jupiter's
stratosphere lower than the 0.2 mbar altitude region.
