The specific heat capacity of Pb 1- x Ge x Te has been measured by means of a.c. calorimetry method in x ranging from 0.05 to 0.3. We found that the specific heat capacity exhibits a steplike behavior at T c up to x =0.07 and additionally critical behavior becomes appreciable at x =0.3. These trends are very similar to those in Sn 1- y Ge y Te. The anomalous specific heat above T c was found to fit well to logarithmic law. The jump Δ C p is 0.92 J mol -1 K -1 in the crystal with x =0.05, which is comparable with the value 0.87 J mol -1 K -1 estimated by using the Landau-type free energy expansion coefficients by Sugai et al. The increase of Δ C p with T c is well explained by assuming that T c is close to tricritical point.