An indoor unit for an air-conditioning apparatus, the indoor unit comprising: an indoor-unit main body including a heat exchanger and a fan and having an opening formed in a lower surface of the indoor-unit main body; a decorative panel configured to cover a peripheral edge portion of the opening of the indoor-unit main body; a suction panel configured to cover an opening of the indoor-unit main body in an openable manner, the opening being formed by the decorative panel, and having an air inlet communicating with the opening; a protruding piece protruding horizontally from the decorative panel toward the opening of the indoor-unit main body; an engagement member provided on a back surface of the suction panel at a position of being opposed to the protruding piece to be slidable with respect to the protruding piece in a front-and-back direction of the indoor unit, the engagement member being configured to be guided by the protruding piece of the decorative panel to be locked to the protruding piece; plate springs, provided at both ends in directions orthogonal to a sliding direction of the engagement member, the plate springs extending in the directions orthogonal to the sliding direction and opposite to each other; and, for each of the plate springs, at least one spring support portion, formed on the suction panel, wherein, each of the plate springs is configured to, when the engagement member slides in a retreating direction of the engagement member by the protruding piece, urge the engagement member toward the protruding piece with the at least two spring support portions (15b, 15c) serving as supporting points characterized in that, for each of the plate springs, at least two spring support portions (15b, 15c) are formed on the suction panel provided at different positions of the engagement member wherein one end of each of the plate springs is fitted into the engagement member and the other end of each of the plate springs is sandwiched between the at least two spring support portions (15b, 15c). an indoor-unit main body including a heat exchanger and a fan and having an opening formed in a lower surface of the indoor-unit main body; a decorative panel configured to cover a peripheral edge portion of the opening of the indoor-unit main body; a suction panel configured to cover an opening of the indoor-unit main body in an openable manner, the opening being formed by the decorative panel, and having an air inlet communicating with the opening; a protruding piece protruding horizontally from the decorative panel toward the opening of the indoor-unit main body; an engagement member provided on a back surface of the suction panel at a position of being opposed to the protruding piece to be slidable with respect to the protruding piece in a front-and-back direction of the indoor unit, the engagement member being configured to be guided by the protruding piece of the decorative panel to be locked to the protruding piece; plate springs, provided at both ends in directions orthogonal to a sliding direction of the engagement member, the plate springs extending in the directions orthogonal to the sliding direction and opposite to each other; and, for each of the plate springs, at least one spring support portion, formed on the suction panel, wherein, each of the plate springs is configured to, when the engagement member slides in a retreating direction of the engagement member by the protruding piece, urge the engagement member toward the protruding piece with the at least two spring support portions (15b, 15c) serving as supporting points characterized in that, for each of the plate springs, at least two spring support portions (15b, 15c) are formed on the suction panel provided at different positions of the engagement member wherein one end of each of the plate springs is fitted into the engagement member and the other end of each of the plate springs is sandwiched between the at least two spring support portions (15b, 15c).