  A diamond anvil cell (DAC) which can generate extremely high pressure of
multi-megabar is promising tool to develop a further physics such a
high-transition temperature superconductivity. However, electrical transport
measurements, which is one of the most important properties of such functional
materials, using the DAC is quite difficult because the sample space is very
small and a deformation of electrodes under extreme condition. In this study,
we fabricated a boron-doped diamond micro-electrode and an undoped diamond
insulation on a beveled culet surface of the diamond anvil. By using the
developed DAC, we demonstrated the electrical transport measurements for sulfur
hydride H$_2$S which known as a pressure-induced high-transition temperature
superconducting H$_3$S at high pressure. The measurements were successfully
conducted under high pressure up to 192 GPa, and then a multi-step
superconducting transition composed from pure sulfur and some kinds of surfer
hydrides, which is possible HS$_2$, was observed with zero resistance.
