A refrigerator comprising: a refrigerator body (101; 301; 501); a freezing compartment (155; 205, 255) of a freezing temperature zone in the refrigerator; a cooler compartment (123; 323; 523; 623) including a cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) provided on a back surface side of the freezing compartment (155; 205, 255), the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) for generating cool air, a defrosting heater (132, 182; 232, 282; 332, 382; 432; 532; 632) provided below the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607), and a drain pan (134, 184; 234, 284; 334, 384; 434; 534; 634) provided below the defrosting heater (132, 182; 232, 282; 332, 382; 432; 532; 632), the drain pan (134, 184; 234, 284; 334, 384; 434; 534; 634) for receiving defrosting water dropped after frost attached to the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) is melted; and a cooler cover (120, 170; 220, 270; 320, 370; 420; 520; 620) covering the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) and having a cool air return port (135, 185; 235, 285; 335, 385; 435; 535; 635) through which the cool air after cooling the freezing compartment (155; 205, 255) is returned to the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607), wherein center of the defrosting heater (132, 182; 232, 282; 332, 382; 432; 532; 632) is set on an upper side of a lower surface of the freezing compartment (155; 205, 255) in a horizontal direction, a projection member (136, 186; 236, 286; 336; 536) protruding on an interior side is arranged on the lower surface of the freezing compartment (155; 205, 255), a lower end of the cool air return port (135, 185; 235, 285; 335, 385; 435; 535; 635) and an upper end of the projection member (136, 186; 236, 286; 336; 536) are overlapped with each other in a height direction, characterized in that a plurality of wind direction guide portions (122; 222, 272; 322, 372; 422; 522) are provided in the cool air return port (135, 185; 235, 285; 335, 385; 435; 535; 635), wherein in the plurality of wind direction guide portions (122; 222, 272; 322, 372; 422; 522), a lower wind direction guide portion (122; 222, 272; 322, 372; 422; 522) is longer than an upper wind direction guide portion (122; 222, 272; 322, 372; 422; 522) on a side of the defrosting heather (132, 182; 232, 282; 332, 382; 432; 532; 632). a refrigerator body (101; 301; 501); a freezing compartment (155; 205, 255) of a freezing temperature zone in the refrigerator; a cooler compartment (123; 323; 523; 623) including a cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) provided on a back surface side of the freezing compartment (155; 205, 255), the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) for generating cool air, a defrosting heater (132, 182; 232, 282; 332, 382; 432; 532; 632) provided below the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607), and a drain pan (134, 184; 234, 284; 334, 384; 434; 534; 634) provided below the defrosting heater (132, 182; 232, 282; 332, 382; 432; 532; 632), the drain pan (134, 184; 234, 284; 334, 384; 434; 534; 634) for receiving defrosting water dropped after frost attached to the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) is melted; and a cooler cover (120, 170; 220, 270; 320, 370; 420; 520; 620) covering the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607) and having a cool air return port (135, 185; 235, 285; 335, 385; 435; 535; 635) through which the cool air after cooling the freezing compartment (155; 205, 255) is returned to the cooler (107, 157; 207, 257; 307, 357; 407; 507; 607), wherein center of the defrosting heater (132, 182; 232, 282; 332, 382; 432; 532; 632) is set on an upper side of a lower surface of the freezing compartment (155; 205, 255) in a horizontal direction, a projection member (136, 186; 236, 286; 336; 536) protruding on an interior side is arranged on the lower surface of the freezing compartment (155; 205, 255), a lower end of the cool air return port (135, 185; 235, 285; 335, 385; 435; 535; 635) and an upper end of the projection member (136, 186; 236, 286; 336; 536) are overlapped with each other in a height direction, characterized in that a plurality of wind direction guide portions (122; 222, 272; 322, 372; 422; 522) are provided in the cool air return port (135, 185; 235, 285; 335, 385; 435; 535; 635), wherein in the plurality of wind direction guide portions (122; 222, 272; 322, 372; 422; 522), a lower wind direction guide portion (122; 222, 272; 322, 372; 422; 522) is longer than an upper wind direction guide portion (122; 222, 272; 322, 372; 422; 522) on a side of the defrosting heather (132, 182; 232, 282; 332, 382; 432; 532; 632).