A washing machine includes: a washing tub in which clothes are stored; and a water supply mechanism for supplying water into the washing tub through a water supply path, the water being supplied from a water supply source. The water supply mechanism includes a water supply valve for opening and closing the water supply path, a water filling case for filling water into the washing tub, and a fine bubble generation device provided between the water supply valve and the water filling case and for generating fine bubbles.