PURPOSE: A monitoring camera accurately maintains the horizontal level between an imaging surface of an imaging unit and a lens unit, preventing generating the tilt of a lens mounting unit. CONSTITUTION: A front cover (110) forms a camera housing by bonding with a body casing. A first protruded portion (112) protrudes from the front side of the front cover to the front of the front cover. A second protrusion portion (114) is formed on the outside of the first protrusion portion. A lens mounting portion (120) is combined with the front cover. A diameter guide portion (122) of the lens mounting portion protrudes to the front cover and contacts with the first protrusion portion. A guide portion (126) of the lens mounting portion contacts with the second protrusion portion.
