An image capturing device includes a camera unit and a casing enclosing the camera unit. The camera unit includes an optical lens and an image sensing module. The casing includes a first housing body, a second housing body attachable to the first housing body, a front enclosure, and a back enclosure. The first housing body, the second housing body, the front enclosure, and the back enclosure jointly enclose a receiving space. A first ventilating window is disposed on the first housing body or the second housing body, and a second ventilation window is disposed on the back enclosure. The first ventilating window and the second ventilation window are configured to provide ventilation to the receiving space.