A windscreen wiper device comprising an elastic, elongated carrier element, as well as an elongated wiper blade (2) of a flexible material, which can be placed in abutment with a windscreen to be wiped, which wiper blade (2) includes opposing longitudinal grooves (3) on its longitudinal sides, in which grooves spaced-apart longitudinal strips (4) of the carrier element are disposed, wherein neighbouring ends (5) of said longitudinal strips (4) are interconnected by a respective connecting piece (6), which windscreen wiper device comprises a connecting device (7) for an oscillating arm (8), as well as a spoiler (11) detachably connected to the wiper blade (2), with the special feature that said spoiler (11) comprises a less-flexible profile (13) which is slidably mounted on a mounting portion of the wiper blade (12).