Thermoelectric power, electrical resistivity, I-V characteristics, relative electrical permittivity, dc magnetization and ac magnetic susceptibility measurements carried out on Cu5SbO6 showed p-type semiconducting behaviour with the activation energy of 0.24 eV as well as ferrimagnetic order with the Neel temperature of 5.2 K. The effective magnetic moment of 5.857 μB/f.u. revealed the orbital contribution to the magnetic moment. Large value of the relative electrical permittivity indicated that the Cu2+ ions with the unscreened and unfilled electron shells are responsible for the polarizability and forming of electric dipoles.