An electrolytic in-process dressing method, an electrolytic in-process dressing grinding apparatus, and an electrolytic in-process dressing grindstone, for grinding workpiece as the grindstone is being subjected to electrolytic in-process dressing, are provided, in which the grindstone is made of abrasive grains and a binding material which is capable of forming a uniform and fine passive layer at the grinding surface thereof and also capable of preventing excessive elusion of the binding material, thereby preventing the formation of chips at the ground surface in the course of grinding operation.