Cylinder deactivation apparatus of engine

The present invention relates to a cylinder rest device of a simple configuration and at the same time the engine is operating reliability hwakbodoem. Cylinder rest apparatus for an engine according to an embodiment of the present invention, an optional cylinder rest apparatus for an engine of a tissue along the at least one cylinder of the plurality of cylinders receive delivering intake air from the intake manifold to the operating state of the engine, the intake manifold and at least one idle air intake passage through which one end is in communication; An intake passage communicating the at least one cylinder is selectively tissue in accordance with the operation state of the engine, the other end of the idle air intake passage; Idle throttle valve which is arranged on the idle air intake passage, for selectively opening and closing the idle air intake passage; And a controller for controlling the operation of the idle throttle valve; may include. The control unit may be by operating the idle throttle valve in accordance with the operation state of the engine intake air is selectively fed to the by selectively opening and closing the idle air intake passage, wherein the at least one cylinder.