According to one embodiment of the present invention, a crack measurement device and a crack measurement method are provided. The crack measurement device according to one embodiment of the present invention comprises: an ultrasound sensor for emitting a first ultrasound wave, to be focused on the bottom surface of an object to be inspected, in the vertical direction of the bottom surface of the object to be inspected, and receiving a reflected wave reflected from the bottom surface of the object to be inspected; and a monitoring unit for providing information on cracks on the basis of the intensity of the reflected wave.