A semiconductor device includes a target layer disposed on a substrate, and a crack sensor for detecting a crack generated in the target layer. The crack sensor includes a first conductive pattern positioned at a bottom surface of the target layer, a second conductive pattern positioned on a top surface of the target layer, the top surface being opposite to the bottom surface of the target layer, a plurality of resistors, and nodes. The plurality of resistors are connected in parallel to each other through the first conductive pattern and the second conductive pattern. Each of the plurality of resistors is disposed to substantially penetrate the target layer.