812 and second main deflectors 812 a are provided in correspondence to the both direction rotation and a structure of the supplementary deflectors 814 a is modified in detail the first main deflectors 812 are formed on an underside of the upper surface portion of the tub cover 800 at fixed intervals and the second deflectors 812 a are formed in symmetry to the first main deflectors 812 and a fore end of the supplementary deflector 814 a has a fore end started from the inner circumference and extended along a concentric circle of the tub cover and an aft end connected to the inner circumference of the tub cover that is the fore end of the supplementary deflector 814 a is positioned spaced from the fore end of the first main deflector 812 and the aft end of the supplementary deflector 814 a is positioned spaced from the fore end of the second main deflector 812 a and preferably there are a plurality of ribs 818 between the first main deflectors and the second main deflectors 812 a for preventing distortion and more preferably concentric to the tub cover circumference and a portion of an outer rib may be cut away the ribs 818 are fitted under the following reasons the washing water passed over the main deflectors 812 and 812 a may cause a vortex between the first and the second main deflectors 812 and 812 a or may flow to the outlet of the main flow passage to interfere the washing water flow in the main flow passage therefore the ribs 818 are provided to confine the washing water between the first and second deflectors 812 and 812 a to some extent for preventing interference to.