A windscreen wiper device of the “flat blade type” comprising an elastic, elongated carrier element, as well as an elongated wiper blade of a flexible material and a connecting device for a oscillating arm comprising two longitudinal arm sections connected to each other by means of a curved intermediate section and a resilient tongue engaging in a correspondingly shaped hole provided in the oscillating arm, wherein the resilient tongue comprises at least two, spaced-apart, downwardly extending protrusions, wherein a first protrusion is adapted to engage in a correspondingly shaped hole provided in an oscillating arm of a first type, and wherein a second protrusion is adapted to engage in a correspondingly shaped hole provided in an oscillating arm of a second type, the oscillating arms of the first and the second types mutually differing in the distance between their respective longitudinal arm sections.