A remote monitor (1; 10) for a home appliance, the remote monitor (1; 10) being connected to at least one home appliance with a predetermined communication system for displaying, and controlling of a state of the home appliance at a place far from the home appliance, comprising: a case forming an outside appearance of the remote monitor (1; 10), including a lower case (100; 1100), and an upper case (400; 1400) detachably mounted on an upper side of the lower case (100; 1100), the upper case (400; 1400) having a window (410; 1410); and a control board in the case, the control board having various electronic components mounted thereon, wherein one of the upper case (400; 1400) and the lower case (100; 1100) includes a rim (130; 1130), and the other one includes a groove (430; 1430) in conformity with the rim (130; 1130), a circumference of the case having the groove (430; 1430) has double circumferences with an inner circumference (432; 1432) positioned on an inner side of the groove (430; 1430) and an outer circumference (431; 1431) positioned on an outer side of the groove, and the inner circumference (432; 1432) has a projection length longer than a projection length of the outer circumference (431; 1431), characterized in that one of the upper case (400; 1400) and the lower case (100; 1100) includes hooks (133; 1133) and the other one includes hook holes (433; 1433) in conformity with the hooks (133; 1133), the control board includes: a communication modem board (200; 1200) for transmission/reception of data to/from the home appliance, and a display board (300; 1300) mounted on the communication modem board (200; 1200) fixedly, or detachably for displaying a state of the state of the home appliance to an outside, the display board (300; 1300) is exposed through the window (410; 1410), and the remote monitor (1; 10) further comprises a see-through sheet (600; 1600) on an upper surface of the upper case (400; 1400), which is an exposed surface, for see-through an inside through the window, and a protective sheet (700; 1700) on an upper surface of the see-through sheet having a see-through window (710; 1710) in correspondence to the window (410; 1410) on the upper case (400; 1400). a case forming an outside appearance of the remote monitor (1; 10), including a lower case (100; 1100), and an upper case (400; 1400) detachably mounted on an upper side of the lower case (100; 1100), the upper case (400; 1400) having a window (410; 1410); and a control board in the case, the control board having various electronic components mounted thereon, wherein one of the upper case (400; 1400) and the lower case (100; 1100) includes a rim (130; 1130), and the other one includes a groove (430; 1430) in conformity with the rim (130; 1130), a circumference of the case having the groove (430; 1430) has double circumferences with an inner circumference (432; 1432) positioned on an inner side of the groove (430; 1430) and an outer circumference (431; 1431) positioned on an outer side of the groove, and the inner circumference (432; 1432) has a projection length longer than a projection length of the outer circumference (431; 1431), characterized in that one of the upper case (400; 1400) and the lower case (100; 1100) includes hooks (133; 1133) and the other one includes hook holes (433; 1433) in conformity with the hooks (133; 1133), the control board includes: a communication modem board (200; 1200) for transmission/reception of data to/from the home appliance, and a display board (300; 1300) mounted on the communication modem board (200; 1200) fixedly, or detachably for displaying a state of the state of the home appliance to an outside, a communication modem board (200; 1200) for transmission/reception of data to/from the home appliance, and a display board (300; 1300) mounted on the communication modem board (200; 1200) fixedly, or detachably for displaying a state of the state of the home appliance to an outside, the display board (300; 1300) is exposed through the window (410; 1410), and the remote monitor (1; 10) further comprises a see-through sheet (600; 1600) on an upper surface of the upper case (400; 1400), which is an exposed surface, for see-through an inside through the window, and a protective sheet (700; 1700) on an upper surface of the see-through sheet having a see-through window (710; 1710) in correspondence to the window (410; 1410) on the upper case (400; 1400).