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, which can be placed in abutment with a windscreen to be wiped, which wiper blade includes at least one longitudinal groove, in which groove a longitudinal strip of the carrier element is disposed, which windscreen wiper device comprises a connecting device for an oscillating arm, wherein said oscillating arm can be pivotally connected to said connecting device about a pivot axis near a free end of said oscillating arm, with the interposition of a joint part, wherein said joint part is detachably connected to said connecting device by engaging protrusions (10,11) of said connecting device, at the location of said pivot axis, in recesses (12,13) provided in said joint part, wherein said protrusions (10,11) of said connecting device are provided with co-axial through holes, wherein - an upper surface of said joint part comprises a recess arranged to accommodate a L-shaped shoulder provided near said free end of an oscillating arm of a first type, wherein said co-axial through holes are arranged to receive a transverse pivot pin provided near said free end of said oscillating arm of the first type, and wherein a side of said joint part is arranged to abut a leg of said L-shaped shoulder disposed at an end thereof and facing a windscreen to be wiped; - said joint part comprises at least one resilient tongue arranged to engage into a correspondingly shaped hole provided in a base of a U-shaped cross-section of an oscillating arm of a second type, wherein said resilient tongue is hingeable about a hinge axis between a inward position, wherein said wiper blade can be released from said oscillating arm of the second type, and an outward position, wherein said wiper blade can be retained on said oscillating arm of the second type; - said joint part is provided with a free end having a recess arranged to accommodate said free end of an oscillating arm of a third type, wherein said joint part comprises at least one protrusion extending laterally from a longitudinal side of said joint part, said protrusion being arranged to hook behind a correspondingly shaped protrusion on said oscillating arm of the third type for blocking a longitudinal movement of said wiper blade with respect to said oscillating arm of the third type, wherein a cover is detachably connected to said joint part, characterized in that an upper surface of said cover comprises a recess arranged to accommodate - a rod-shaped oscillating arm of a fifth type; - a L-shaped shoulder near said free end of an oscillating arm of the first type, wherein said cover comprises a cap provided with a protrusion in use extending in downward direction towards a windscreen to be wiped, and wherein said downwardly extending protrusion is adapted to engage in a correspondingly shaped hole provided in said oscillating arm of the fifth type for retaining said wiper blade onto said oscillating arm of the fifth type. - an upper surface of said joint part comprises a recess arranged to accommodate a L-shaped shoulder provided near said free end of an oscillating arm of a first type, wherein said co-axial through holes are arranged to receive a transverse pivot pin provided near said free end of said oscillating arm of the first type, and wherein a side of said joint part is arranged to abut a leg of said L-shaped shoulder disposed at an end thereof and facing a windscreen to be wiped; - said joint part comprises at least one resilient tongue arranged to engage into a correspondingly shaped hole provided in a base of a U-shaped cross-section of an oscillating arm of a second type, wherein said resilient tongue is hingeable about a hinge axis between a inward position, wherein said wiper blade can be released from said oscillating arm of the second type, and an outward position, wherein said wiper blade can be retained on said oscillating arm of the second type; - said joint part is provided with a free end having a recess arranged to accommodate said free end of an oscillating arm of a third type, wherein said joint part comprises at least one protrusion extending laterally from a longitudinal side of said joint part, said protrusion being arranged to hook behind a correspondingly shaped protrusion on said oscillating arm of the third type for blocking a longitudinal movement of said wiper blade with respect to said oscillating arm of the third type, wherein a cover is detachably connected to said joint part, characterized in that an upper surface of said cover comprises a recess arranged to accommodate - a rod-shaped oscillating arm of a fifth type; - a L-shaped shoulder near said free end of an oscillating arm of the first type,