A washing machine having an improved coupling structure for coupling a drive unit to a tub is disclosed. The washing machine includes a bearing housing supporting a bearing, a water tub provided on the bearing housing by injection molding such that the bearing housing can be inserted into the tub, and a drive unit coupled to the tub. The drive unit includes a stator and a rotator. A fastening part is formed on the tub such that the stator can be coupled to the fastening part. In the washing machine, the drive unit is directly coupled to the tub without a separate member such as a base, thereby improving assembling efficiency while reducing work time. In addition, the bearing housing is formed with a blade to distribute applied stress to the tub and the bearing housing, thereby preventing damage of the bearing housing or the tub due to stress concentration.