A wiper adapter detachably coupled between a wiper arm and a wiper having a pivot shaft, the adapter comprises a first coupling element and a second coupling element. The first coupling element has a shaft cavity provided with a notch that is in communication with the shaft cavity; the pivot shaft can be assembled into the shaft cavity radially through the notch and can pivotably fit in the shaft cavity. The second coupling element can snap to the pivot shaft so as to prevent the pivot shaft from leaving the shaft cavity through the notch.