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A photometric study of variable stars in the field of old open cluster NGC188 is discussed. Observations were carried out in two bands R and I for 5513stars up to R = 17 mag in the field of 1.5 x 1.5 grad. around the cluster. Thephotometric data were processed by the console application "Astrokit", whichcorrects brightness variations associated with the variability of atmospherictransparency and carries out searching for variable stars. We found 18 newvariable stars and determined the parameters of one previously known variable.Among discovered stars one is a low-amplitude pulsating variable, one is a EWeclipsing binary, six are eclipsing variables of EA type, five objects are longperiod variables, and for five stars variability type remains uncertain.

New variable stars in the field of open cluster NGC188