PURPOSE: To prevent so-called a half-opened door state in a storage box having drawer type storage vessels in upper and lower stages in a storage chamber.

CONSTITUTION: A lower storage vessel 18 having a door 15 is telescopically contained in a lower section of a freezing chamber 13 via fixed rails, and an upper storage vessel 19 is telescopically contained in an upper section via guide rails 20. When the door 15 is pressed, a protrusion 22 is engaged with a wall surface 21a, and hence the vessel 19 is contained together with the vessel 18. The positional relationship between the protrusion 22 and the surface 21a is so formed as to complete containing of the vessel 19 before the vessel 18 is completely contained and to disengage the engagement of the protrusion 22 with the surface 21a at an upper position than a recess 21 when the vessel 19 is disposed at a containing position.