Temperature dependence of the self-diffusivities in B2-type intermetallic compounds has been investigated. The self-diffusivities plotted against the inverse of temperature normalized by the solidus temperatures, Tf, show that the activation energy, Q, is related to Tf by Q = (19±8)RTfB2 J/mol, and the pre-exponential factor, D0, is in a certain range, D0 = 10-2 to approximately 10-6 m2s-1. However, the results of CuZn, which have the order-disorder transformation below solidus temperature, are out of range of a large number of data. The hypothetical T0 temperature between the ordered and liquid phases, T0B2, is evaluated from thermodynamic consideration, which reveals that the temperature dependence of the self-diffusivity of CuZn replotted against T0B2/T shows a tendency similar to that of other B2-type intermetallic compounds. The relationship between the activation energy of self-diffusion and the enthalpy of fusion of the ordered phase is also discussed.