Abstract: A blade for a blade exchangeable razor is provided which realizes easy use and smooth haircutting. The razor is adapted to exchangeably support a blade by a blade holder. The blade comprises a thin blade portion having an edge and a back support including side plates for supporting the thin blade portion therebetween and a pair of protrusions formed on the side plates in the longitudinal direction thereof at positions of the side plates close to lower ends of the blade holder. Since the pair of protrusions on the side plates of the back support are located proximal to the lower ends of the blade holder, hair cut by the edge moves away from the blade holder by the action of the protrusions, thereby preventing the cut hair from entering between the back support and the blade holder.