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We studied single crystals of orthorhombic Sr 2 VO 4 containing spin-singlet dimers of V 4+ (3d 1) and those with Ti or Nb substituted for V. We found that both Ti and Nb doping induces the evolution of a Curie-Weiss component in the magnetic susceptibility, but the rate of evolution with doping is several times higher for Nb doping. We also found that Nb doping induces the conduction of d electrons. These results can be explained by the hybridization of the Nb 4d states with the 3d states of the neighboring V ions, possibly causing rearrangement of the d electron in the doubly degenerate e states in the V ion.