The purpose of the present invention is to provide a tray for taking an image inside the oral cavity, which is not exposed to risk elements such as radiation or the like and does not need an organized technology, and to a device and a system for taking the image inside the oral cavity comprising the tray for taking the image inside the oral cavity. According to an embodiment, the tray for taking the image inside the oral cavity comprises: a foreside wall covering a dorsal surface of a set of teeth in the oral cavity； and a backside wall covering a ventral surface of the set of teeth in the oral cavity. A plurality of camera modules are installed on either the foreside wall or the backside wall.본 발명의 일실시예에 따른 구강촬영용 트레이는 구강 내 치열의 배면(背面)을 감싸는 전면장벽, 구강 내 치열의 복면(腹面)을 감싸는 후면장벽 및 전면장벽과 후면장벽 중 적어도 어느 하나에 복수 개의 카메라모듈이 설치된다.
