The present disclosure provides a stain removal device capable of performing partial beating and washing on a cloth product, automatically supplying liquid and applying a beating force to a stain portion appearing on the cloth product, preventing liquid leakage and realizing miniaturization. The stain removal device includes: a cassette mechanism, which includes a head portion having a beating surface and a water supply bottle for accommodating liquid, where water supply paths are from the water supply bottle and throughout the head portion; and a device main body, which includes a vibration unit mountable by pressing the cassette mechanism and detachable by pulling out the vibration unit and is configured to apply a vibration to the cassette mechanism towards a direction substantially orthogonal to the beating surface of the head portion through supplied electric power.