We evaluated the washing performance of 3 basic type and 6 domestic automatic washing machines using the evaluation method of Katayama et al. The 3 basic types were the agitator type (JIS standard washing machine), the tumbler style (Wascator), and the whirlpool type (Two-tub washing machine). The 6 domestic automatic washing machines were 4 tumble style washing machines, 1 whirlpool type washing machine and 1 beat-wash type washing machine sold in the last five years. As a result of a comparison of their washing performance, the JIS standard washing machine removed dirt much better than the others, and its Mechanical Action Value was much higher than the others. The two-tub washing machine showed the second best detergency and Mechanical Action Value. The Wascator showed much worse detergency, and its Mechanical Action Value varied widely. We also tried to examine the washing performance of the standard washing course of each of the 6 domestic automatic washing machines for 4.0kg loads washed in water for 10min. As a result of a comparison with their previous washing performance, their detergency was no different, but their Mechanical Action Values varied widely.