A conductive roller including a core metal and a conductive elastic layer disposed on a peripheral surface of the core metal. The conductive roller has an electrostatic capacity not more than 50 pF at 100 Hz and an electric resistance not less than 10.sup.5.OMEGA. nor more than 10.sup.9.OMEGA. at an applied voltage 1000V. An electrostatic capacity C (L) at an alternating low frequency (L) and an electrostatic capacity C (H) at an alternating high frequency (H) satisfy the following relationship: 0<(C(L)-C(H))/(log.sub.10 Hz(H)-log.sub.10 Hz(L))<10.