Time-series observations were carried out using a 155mm refractor and a $2k{ imes}3k$ CCD camera at Bohyunsan Optical Astronomy Observatory. We found 38 new variable stars in the $2.3^{circ}{ imes}2.4^{circ}$ region around the Cepheid variable TU Cas: 22 eclipsing binary stars, 11 ${delta}$ Scuti type stars and an RR Lyrae star, and 4 unclassified variables.