To provide a kitchen cabinet that efficiently drain water, does not cause damage in appearance, and permits an effective use of the opened face of a sink as a cooking space.

In the kitchen cabinet (1) in which the sink (4) is arranged and the top face of a counter (2) in the vicinity of the sink is made a cooking space, drain holes (3) are arranged in a part of the top face of the counter (2), a draining step portion (5) opening to the drain holes (3) and continued to the sink (4) is provided in the lower portion thereof. A plate (6) installed over plate mounting portions (42) formed in the facing portions (41) of the sink is drawably provided in the draining step portion (5).