A washing agent dispenser is described, for a household washing machine, namely a dishwasher, said dispenser (10) comprising a tank (12) for containing a liquid washing agent, to which a device (DS) is associated for the visual control of the level of said liquid washing agent. According to the invention, said control device (DS) comprises a plurality of elements of a substantially transparent material (17), which are inserted in respective passages extending between said tank (12) and the outside of the body (11) of the dispenser (10). The parts (17D) of each one of said transparent elements (17) which are visible outside said body (11) form the steps of a scale indicating the level of said liquid washing agent contained in the tank (12).