To provide an electrode for electrolysis which has improved physical strengths, is almost prevented from causing the deformation due to an occlusion phenomenon, and has enhanced electrolysis efficiency and long life.

This electrode for electrolysis has two electrode plates 38 confronting each other and arranged almost in parallel with a specified distance and a connection plate 39 for connecting, at its peripheral sides, the two electrode plates 38. The inner space formed by the two electrode plates 38 and the connection plate 39 is used as a cooling chamber 40 through which cooling water passes.