To form a cold air curtain of little turbulence at a showcase front face by positioning and setting a drawing-out position of a cold supply opening corresponding to an installation stage of a branched duct, with respect to the branched duct provided with a blower-type cold supply opening at its end and disposed inside of the showcase.

In this cold air circulation type multi-stage showcase provided with the branched duct 9 for supplying cold air, disposed on an intermediate position in the showcase along a commodity display shelf for guiding the cold air taken from a cold air circulation passage to the showcase front part, and forming the cold air curtain at the showcase front face, the showcase comprises the drawer type cold air supply opening 9c on a front part of the branched duct 9, and is provided with a decorated screw 13 and a threaded hole 15 for positioning as adjusting means for setting the drawing-out position of the cold air supply opening to a proper position designated in advance corresponding to the installation stage of the branched duct. The cold air curtain is formed at a fixed position of the showcase front part through the branched duct, and the showcase stabilizes cold storage performance.