The present invention relates to a ceiling-embedded type linear lighting device including: a housing having a receiving space formed therein and having an open side at one end; and at least one lighting module including: a light emitting body including a plurality of light emitting devices disposed on a substrate in a length direction thereof, a fixing plate allowing the light emitting body to be fixed thereto, and elastic portions disposed to be inclined from both side surfaces of the fixing plate so as to be elastically supported by an inside surface of the housing at the receiving space, so that the lighting module is vertically, detachably coupled to an interior of the receiving space from a front of the open side of the receiving space of the housing, wherein the elastic portions and the inside surface of the housing at the receiving space are provided with a first coupling portion and a second coupling portion, the first coupling portion and the second coupling portion being engaged with each other.