A sanitary insert unit having a jet regulator, an attachment screen arranged upstream of the jet regulator, and a throughflow-quantity regulator, provided between the jet regulator and attachment screen, having an elastic flow-restricting body that encloses, between itself and a regulating profiling provided on a circumferential wall, a water pressure changeable control gap. The throughflow-quantity regulator is releasably retained on the jet regulator and the attachment screen is releasably retained on the throughflow-quantity regulator. The regulating profiling is provided on the circumferential wall of a regulating body that is connected to a holder via at least one connecting crosspiece that acts as a holding-down part for the flow-restricting body, which is arranged between the connecting crosspiece and the jet regulator. The holder's inflow-side end periphery region is releasably fastened on the attachment screen and its outflow-side end periphery region is releasably fastened on the inner circumference of the regulator housing.