  We have searched for proton decay via $p \rightarrow \nu K^{+}$ using
Super-Kamiokande data from April 1996 to February 2013, 260 kiloton$\cdot$year
exposure in total. No evidence for this proton decay mode is found. A lower
limit of the proton lifetime is set to $5.9 \times 10^{33}$ years at 90%
confidence level.
