Abstract: An automatic ice-making mechanism for a refrigerator includes a tray having a groove on its bottom surface. A temperature sensor is mounted in the groove. The temperature sensor includes a temperature-sensitive element disposed at a top of the groove, an insulating member disposed beneath the temperature-sensitive element, and a housing pushing the insulating member upwardly against the walls of the groove. The housing has a pair of ribs, each rib carrying a projection that fits into a respective eye formed on the bottom of the tray. The ribs are elastically flexible toward one another to enable the projections to be removed from the eyes.