Recently, the development of visible-light-driven photocatalysts has extensively been studied in terms of using sunlight. The BiVO₄ is a highly active photocatalyst for water oxidation reaction (apparent quantum yield: 9% at 450 nm). The BiVO₄ is usually obtained by a reaction of layered vanadate powder (KV₃O₈ and K₃V₅O₁₄) with Bi(NO₃)•5H₂O in aqueous media at room temperature and a urea method. In the present study, we investigated the photocatalytic and photoelectrochemical properties of the BiVO₄ photocatalyst prepared in acetic acid solution. The BiVO₄ photocatalyst was prepared by mixing Bi₂O₃ and V₂O₅ in an aqueous acetic acid solution. The obtained BiVO₄ was calcined at 673 K for 5 ~10 hours in the air. SEM observation revealed that the particle size of obtained BiVO₄ (50 ~300 nm) was smaller than those obtained by reported methods. This BiVO₄ photocatalyst showed photocatalytic activities for oxygen evolution from an aqueous AgNO₃ solution and methylene blue degradation under visible light irradiation. The photoelectrochemical properties of BiVO₄ were also examined. BiVO₄ electrodes were prepared by pasting the BiVO₄ powder on an ITO plate and subsequently calcination. This electrode gave an excellent anodic photocurrent under visible light irradiation. Thus, we have successfully developed a visible-light-responsive the photo-electrode.