The present invention relates to an air quality detector to integrate an arrangement of sensors. According to the present invention, the air quality detector comprises: a casing main body including a bottom and a sidewall upwardly extended from the surrounding of the bottom; a first printed circuit board (PCB) horizontally arranged on the upper side of the bottom; a second PCB horizontally arranged in a first region on the upper side of the first PCB; a CO_2 sensor mounted on the second PCB; a volatile organic compound (VOC) sensor mounted in a second region closer to the sidewall than the first region on the upper surface of the first PCB; a third PCB having a wireless communication (Wi-Fi) module, horizontally arranged at an upper position spaced apart from the bottom than that of the first PCB, and arranged in a third region which has at least one part not overlapped with the first PCB when the bottom is viewed from an upper side; a fourth PCB horizontally arranged on an upper side than the second and third PCBs; and a dust sensor mounted on the upper surface of the fourth PCB.
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