To prevent a basket body at an upper step from becoming an obstacle when tableware is put in a basket body at a lower step, ensure a large area of the basket body at the upper step, and take out a filter for leftover vegetables easily irrespective of a direction of the tableware basket.

A dishwasher and dryer 1 are arranged on either of left and right sides of a sink 11 of a sink base 10. The basket body 4 at the upper step is disposed by bringing it close to a half part on one side of an upper part of the basket body 5 at the lower step. A pair of auxiliary baskets 6 capable of springing up freely are arranged in two corner parts 5b, 5c at diagonal positions of a lower face part 5a of the basket body 5 at the lower step, respectively. A direction of the tableware basket 3 can be freely inverted to the right and left so that the basket body 4 at the upper step can be arranged by bringing it close to an innermost side G apart from the sink 11 in a washing tank 2 and either of a pair of auxiliary baskets 6 can be arranged above the filter 8 for leftover vegetables.