The invention relates to an attachment device (10) for connecting a wiper arm to a wiper blade (12), which is rigidly connected to an attachment element (22) of the attachment device (10), whereas an adapter (60) is connected to the attachment element (22) in an articulated fashion and is detachably fastened to the wiper arm. According to the invention, the attachment element (22) and the adapter (60) are produced from plastic, and the adapter (60) has a longitudinal bar (74) extending along a longitudinal center plane, said bar supporting a bearing pin (76), which runs transverse to the longitudinal direction, in the central region of the bar. Additionally, the longitudinal bar (74) and the bearing pin (76) protrude to a certain extent beyond the side walls (62) of the adapter (60) to the attachment element (22), the part of the longitudinal bar (74) protruding to the attachment part (26) being guided between two contact surfaces (80), which run in the longitudinal direction and are offset in relation to one another so that in the assembled position, each longitudinal side of the longitudinal bar (74) rests against a contact surface (80) and the longitudinal bar (74) can be rotated through an angle of approximately 45° about a vertical axis between the contact surfaces (80). The length of the bearing pin (76) is dimensioned so that in the assembled position, both ends of the pin engage in bearing holes (50) in the side walls (42) of the attachment part (26).