To provide a built-in air-conditioner, sufficiently securing a maintenance space for a electric equipment box, independently of the conditions of an installation site.

The built-in air-conditioner comprises a unit body 35 to be installed on a ceiling portion of a building and housing a heat exchanger 1 and a fan 2, and the electric equipment box 37 mounted on the outer face of the unit body 35. To-be-opened planned portions 100A, 100B are provided on adjacent side faces 38A, 38B of the unit body 35. The electric equipment box 37 can be selectively mounted on one of the to-be-opened portions 100A, 100B.