The invention relates to a connection device (7) suitable for connecting a wiper blade for a window of a vehicle to a wiper arm, including at least one means (19) for rigid connection onto the wiper blade and a means (25) for linking to the wiper arm, said connection device (7) including a circuit (11) capable of channeling a liquid, characterized in that the circuit (11) is defined by at least one tube (12) and in that the rigid connection means (19) and the linking means (25) are at least partially molded around the tube (12). The invention can be used for motor vehicles.