Problem to be solved. To provide a rice washing device which can prevent such a situation that a rotary valve does not rotate due to chipped pieces of rice and the like entering a space between a case and the rotary valve in a measuring instrument that delivers rice to a rice washing tank from a rice storage tank and resume the supply of rice by removing the chipped pieces of rice and the like when the rotary valve does not rotate. Solution. A rice washing device 1 comprises: a rice storage tank; a rice washing tank; a measuring instrument; a rotary valve with a substantially-C shaped cross section which is provided in the measuring instrument, has an opening and a rice storage chamber, and supplies rice in the rice storage tank to the rice washing tank when being rotated; a case which covers the rotary valve; valve rotation means;...