Low temperature magnetic susceptibility and electrical resistivity measurements have been carried out for the ternary rare earth ruthenium borides RRuB4 (R ≡ Gd, Tb, Dy, Ho, Er, Tm, Lu and Y) with the orthorhombic YCrB4-type structure. Ferromagnetic order was observed for all magnetic compounds except R ≡ Tm, where no transition was observed above 2 K. For the non-magnetic compound YRuB4 the superconducting transition at 1.4 K was confirmed with the onset of 1.36 K in the present study.
