WE CLAIM:
[Claim 1]
An indoor unit for a ceiling-concealed air-conditioning apparatus, the indoor unit comprising:
an indoor-unit body having an air inlet at a bottom;
a decorative panel provided at the bottom of the indoor-unit body and serving as a design surface; and
an inlet grille flap rotatably supported by the decorative panel and covering the air inlet,
the inlet grille flap being provided with a rotational-axis hinge positioned on each of both sides at one edge of the inlet grille flap and serving as a rotational axis of the inlet grille flap, and a latch part positioned between the two rotational-axis hinges and projecting from the one edge,
the decorative panel having a flange positioned below the latch part and supporting the latch part from below when the inlet grille flap is closed. [Claim 2]
The indoor unit for a ceiling-concealed air-conditioning apparatus of claim 1,
wherein the latch part is provided at such a position as not to interfere with peripheral components in a process of opening the inlet grille flap. [Claim 3]
The indoor unit for a ceiling-concealed air-conditioning apparatus of claim 1 or 2,
wherein the inlet grill flap projects to an indoor side relative to the decorative panel when the inlet grille flap is closed. [Claim 4]
The indoor unit for a ceiling-concealed air-conditioning apparatus of any one of claims 1 to 3,
wherein, in side view,
the position where the flange supports the latch part from below when the inlet grille flap is closed is shifted in a vertical direction and in a horizontal

direction from a position where the rotational-axis hinges reside when the inlet grille flap is open. [Claim 5]
The indoor unit for a ceiling-concealed air-conditioning apparatus of any one of claims 1 to 4,
wherein when the inlet grille flap is closed, a distance from an axis of the rotational-axis hinges to a flange-side end of the decorative panel is larger than a distance from the axis of the rotational-axis hinges to a corner of the inlet grille flap at the one edge. [Claim 6]
The indoor unit for a ceiling-concealed air-conditioning apparatus of any one of claims 1 to 5,
wherein the latch part has a trapezoidal shape in front view. [Claim 7]
A ceiling-concealed air-conditioning apparatus comprising:
the indoor unit for a ceiling-concealed air-conditioning apparatus of any one of claims 1 to 6; and
an outdoor unit for a ceiling-concealed air-conditioning apparatus that includes a flow-switching device.