An indoor unit for an air-conditioning apparatus, comprising: a casing having an opening portion formed on a side being a lower surface side when the indoor unit is installed; a decorative panel mounted on the lower surface side of the casing, and having an air inlet formed into a rectangular shape at a position corresponding to the opening portion; levers mounted so as to be opposed to each other on opposed two sides among four sides forming edges of the air inlet of the decorative panel; and hooks mounted at the opening portion of the casing to allow the levers to be hooked thereon, respectively, wherein the decorative panel includes an insertion hole portion formed in a direction perpendicular to a plane of the decorative panel at a position at which each of the levers is to be mounted, and bearing groove portions (7a, 7b) formed in a lower surface portion of the decorative panel so as to extend in parallel with the plane of the decorative panel and extend in directions away from each other with respect to the insertion hole portion, and wherein the each of the levers is movable in the insertion hole portion, and includes a hook portion to be hooked on each of the hooks, and shaft portions (8b, 8c) formed at both ends of the each of the levers, respectively, wherein the hook portion protrudes upward from the insertion hole portion of the decorative panel, and wherein the shaft portions (8b, 8c) are configured to be received in the bearing groove portions (7a, 7b) of the decorative panel, respectively, characterized in that the decorative panel is adapted to, in a temporarily hung state, move downward so that the shaft portions (8b, 8c) and the bearing groove portions (7a, 7b) receiving the shaft portions (8b, 8c) are engaged with each other, wherein, in the temporarily hung state, the decorative panel is restrained from moving downward from a position at which the shaft portions (8b, 8c) are engaged with the bearing groove portions (7a, 7b), and wherein, when the decorative panel is moved upward from this engaged position, the respective lever is moved in the insertion hole portion, and the bearing groove portions (7a, 7b) and the shaft portions (8b, 8c) are disengaged from each other so that the shaft portions (8b, 8c) are moved downward in the bearing groove portions (7a, 7b). a casing having an opening portion formed on a side being a lower surface side when the indoor unit is installed; a decorative panel mounted on the lower surface side of the casing, and having an air inlet formed into a rectangular shape at a position corresponding to the opening portion; levers mounted so as to be opposed to each other on opposed two sides among four sides forming edges of the air inlet of the decorative panel; and hooks mounted at the opening portion of the casing to allow the levers to be hooked thereon, respectively, wherein the decorative panel includes an insertion hole portion formed in a direction perpendicular to a plane of the decorative panel at a position at which each of the levers is to be mounted, and bearing groove portions (7a, 7b) formed in a lower surface portion of the decorative panel so as to extend in parallel with the plane of the decorative panel and extend in directions away from each other with respect to the insertion hole portion, and an insertion hole portion formed in a direction perpendicular to a plane of the decorative panel at a position at which each of the levers is to be mounted, and bearing groove portions (7a, 7b) formed in a lower surface portion of the decorative panel so as to extend in parallel with the plane of the decorative panel and extend in directions away from each other with respect to the insertion hole portion, and wherein the each of the levers is movable in the insertion hole portion, and includes a hook portion to be hooked on each of the hooks, and shaft portions (8b, 8c) formed at both ends of the each of the levers, respectively, wherein the hook portion protrudes upward from the insertion hole portion of the decorative panel, and wherein the shaft portions (8b, 8c) are configured to be received in the bearing groove portions (7a, 7b) of the decorative panel, respectively, characterized in that the decorative panel is adapted to, in a temporarily hung state, move downward so that the shaft portions (8b, 8c) and the bearing groove portions (7a, 7b) receiving the shaft portions (8b, 8c) are engaged with each other, wherein, in the temporarily hung state, the decorative panel is restrained from moving downward from a position at which the shaft portions (8b, 8c) are engaged with the bearing groove portions (7a, 7b), and wherein, when the decorative panel is moved upward from this engaged position, the respective lever is moved in the insertion hole portion, and the bearing groove portions (7a, 7b) and the shaft portions (8b, 8c) are disengaged from each other so that the shaft portions (8b, 8c) are moved downward in the bearing groove portions (7a, 7b).