A monitor camera device (10) has a camera housing (12) and a dehumidification regulation body (14). The dehumidification regulation body (14) has a dehumidification element (42), an electrode, and an engaging portion engaging with an engaged portion of the camera housing (12). One end side of the electrode is constructed so as to supply a power source to the dehumidification element (42), and the other end side penetrates through the engaging portion of the dehumidification regulation body (14). The dehumidification regulation body (14) is detachably attached to the camera housing (12) by the engaging portion of the dehumidification regulation body (14) and the engaged portion of the camera housing (12). The monitor camera device can be downsized while providing a dehumidification regulating function.