A laundry treatment machine includes a water tank, a first laundry tub to accommodate first laundry, a second laundry tub that accommodates second laundry, and a locker provided in the second laundry tub to fix the second laundry tub. The locker includes a locking member that is configured to move from a first position to a second position by a centrifugal force when the second laundry tub is rotated, and engages with the first laundry tub at the second position to fix the second laundry tub to the first laundry tube, and an elastic member which is elastically deformed when the locking member is located at the second position and is restored to an original shape to return the locking member to the first position when the rotation of the second laundry tub is stopped.