The overexpression of folate receptors on the cell surface is related to an abnormality associated with epithelial cancer. In this sense, a capacitive biosensor that uses folic acid as a recognition molecule for biosensing of folate receptors is reported. The biosensor consists of a Ti-W oxides thin film conjugated to folic acid, which is used as working electrode in a three-electrode electrochemical cell configuration. The interactions between the functionalized transducer and the folate receptor has been studied by means of the determination of the electrochemical capacitance using an electrochemical capacitance spectroscopy setup. The Ti-W oxides thin film has been fabricated by the pulsed laser deposition method and subsequently functionalized with folic acid. The characterization of the film before and after functionalization has been obtained by means of AFM, XPS and contact angle. Folate receptor recognition assays show that the biosensor response signal, the chemical hardness (in terms of electrochemical capacitance), is selective and directly proportional to the concentration of folate receptor, with 0.2 nM as limit of detection. This result is promising for the application of this type of detector to the recognition of folate receptors, especially for point of care analysis.