To improve convenience by freely determining the area of trays to be stored respectively, while preventing the mixture of warm air with cold air between a heated storage chamber and a refrigerated storage chamber.

When two front opening/closing doors 10 are opened so as to try to insert the tray 19 to a part between the partition members 3, 3 of upper and lower stages, a flange 19B at the rear end of the tray 19 turns the rocking member 30 of the upper stage partition member 3 clockwise, while lifting upward the front part of the member, and also the cam 25 of the lower stage partition member 3 is pressurized downward by the bottom 19A of the tray 19 to start the insertion of the rear part of the tray 19 to the part between the upper and lower stage partition members 3, 3. When pushing-in is further performed, the flange 19B at the rear end of the tray 19 is resiliently sandwiched between pressure bodies 36B and a cam member 28 urged upward by springs 27, 27 without making a gap, and then, the flange 19B at the front end of the tray is resiliently sandwiched between the pressure body 36A and the cam 25 by urgation force of a tension spring 23 without making a gap.