A dishwasher includes a tub, a basket, a spray device configured to spray washing water, and a sump configured to supply the washing water to the spray device. The spray device includes a first spray rotor including a first spray arm and a shaft integrally formed with the first spray arm to guide the washing water supplied from the sump to the first spray arm, a second spray rotor rotatably coupled to the shaft and including a second spray arm configured to spray the washing water branched from the washing water guided to the first spray arm through the shaft, and a shaft hole formed in the second spray arm to allow the shaft to pass therethrough, and a communication hole formed in the shaft to allow the shaft to communicate with the second spray arm.