Provided is a child lock mechanism which provides satisfactory operability at the time of operation of opening/closing a door while maintaining satisfactory operability at the time of setting/unsetting operation. The child lock mechanism includes: a base member; a first lever; a second lever; and an intermediate member assembled to the first lever and not assembled to the second lever. In a state in which the intermediate member is retained at an unset position, the intermediate member is rotatable relative to the base member, and a rotation center of the first lever relative to the base member and a rotation center of the intermediate member relative to the base member are arranged coaxially with each other.