To provide a rotary blade which enables a deposit to effectively be removed when the rotary blade is rotated for getting a rinse in water, and a method of manufacturing the rotary blade.

The rotary blade 1 includes: a cutting blade 3 which is folded in the shape of a circular arc in section; and a rotary shaft body 2 which supports the cutting blade 3. The rotary shaft body 2 is provided with a shaft body 4, and a plurality of disks 5 disposed in a rotary shaft direction. The cutting blade 3 is secured to the circumference surface of the disks 5. A water flow generating part 8 is formed in at least some of the disks 5. The water flow generating part 8 is constituted by notches formed around each of the disks 5, and through-holes formed through each of the disks 5. By allowing a water flow to collide with the inner surface of the cutting blade 3, and the rotary shaft body 2, the deposit attached thereto can be effectively removed. As the water flow is generated from the interior of the cutting blade 3, the deposit attached to the inner surface of the cutting blade 3 and the rotary shaft body 2 can be effectively removed.