An indoor unit of an air-conditioning apparatus, comprising a front panel (20a to 20d) provided on a front surface side of an indoor unit body, the front panel (20a to 20d) including a base panel formed of an opaque member, and a design panel formed of a transparent member, and having a design layer on a back surface of the design panel, the base panel having a front surface including a first side wall portion formed at an end portion of the base panel in a vertical direction, and extending along a horizontal direction, a second side wall portion formed on a more inner side than the first side wall portion, and extending along the horizontal direction, a groove portion formed between the first side wall portion and the second side wall portion, and having a recessed shape continuous along the horizontal direction, and a plurality of first fitting portions (2d, 2h) provided at intervals on an inner surface side of the first side wall portion, and aligned along the horizontal direction, the design panel having the back surface including a flange formed on a more inner side than an end portion of the design panel in the vertical direction, and protruding along the horizontal direction, and a plurality of second fitting portions (3c, 3h) provided at intervals on an outer surface side of the flange, and aligned along the horizontal direction, each of the plurality of first fitting portions (2d, 2h) comprising a claw portion having a protruding shape, and each of the plurality of second fitting portions (3c, 3h) comprising a recess having a recessed shape, or each of the plurality of first fitting portions (2d, 2h) comprising a recess having a recessed shape, and each of the plurality of second fitting portions (3c, 3h) comprising a claw portion having a protruding shape, the front panel (20a to 20d) being formed of the design panel mounted to a front surface side of the base panel, the flange of the design panel being received in the groove portion of the base panel, the plurality of first fitting portions (2d, 2h) of the base panel and the plurality of second fitting portions (3c, 3h) of the design panel being fitted to each other. a base panel formed of an opaque member, and a design panel formed of a transparent member, and having a design layer on a back surface of the design panel, a first side wall portion formed at an end portion of the base panel in a vertical direction, and extending along a horizontal direction, a second side wall portion formed on a more inner side than the first side wall portion, and extending along the horizontal direction, a groove portion formed between the first side wall portion and the second side wall portion, and having a recessed shape continuous along the horizontal direction, and a plurality of first fitting portions (2d, 2h) provided at intervals on an inner surface side of the first side wall portion, and aligned along the horizontal direction, a flange formed on a more inner side than an end portion of the design panel in the vertical direction, and protruding along the horizontal direction, and a plurality of second fitting portions (3c, 3h) provided at intervals on an outer surface side of the flange, and aligned along the horizontal direction,