An air-conditioning apparatus comprising: a main body including a frame body and a base body provided on a back surface side of the frame body , wherein a plurality of frame body-side engagement sections that project backward, and a plurality of extension sections that are provided on both sides of each frame body-side engagement section and extend backward, are provided on a back side of the frame body , a plurality of base body-side engagement sections that engages with each of the plurality of the frame body-side engagement sections , and a plurality of support bases that are provided below both sides of each of the base body-side engagement sections and are located below the extension section , are provided on a front side of the base body , and when the frame body is pushed into an inside of the base body , each of the frame body-side engagement sections and each of the base body-side engagement sections engage with each other, and each of the extension sections is supported by each of the support bases , and the frame body is mounted to the base body , wherein each of the frame body-side engagement sections includes a frame body-side claw portion (2a1) that projects upward, each of the base body-side engagement sections includes a base body-side claw portion (3a1) that projects downward, and when the frame body is mounted to the base body , the frame body-side claw portions (2a1) and the base body-side claw portions (3a1) engage with each other, and the support bases support the extension sections at a position of the main body ahead of a position where the frame body-side engagement sections and the base body-side engagement sections engage with each other.. a main body including a frame body and a base body provided on a back surface side of the frame body , wherein a plurality of frame body-side engagement sections that project backward, and a plurality of extension sections that are provided on both sides of each frame body-side engagement section and extend backward, are provided on a back side of the frame body , a plurality of base body-side engagement sections that engages with each of the plurality of the frame body-side engagement sections , and a plurality of support bases that are provided below both sides of each of the base body-side engagement sections and are located below the extension section , are provided on a front side of the base body , and when the frame body is pushed into an inside of the base body , each of the frame body-side engagement sections and each of the base body-side engagement sections engage with each other, and each of the extension sections is supported by each of the support bases , and the frame body is mounted to the base body , wherein each of the frame body-side engagement sections includes a frame body-side claw portion (2a1) that projects upward, each of the base body-side engagement sections includes a base body-side claw portion (3a1) that projects downward, and when the frame body is mounted to the base body , the frame body-side claw portions (2a1) and the base body-side claw portions (3a1) engage with each other, and the support bases support the extension sections at a position of the main body ahead of a position where the frame body-side engagement sections and the base body-side engagement sections engage with each other.. <EOS>