A latching device for a detachably attachable type roof panel in a vehicle constructed with a roof of the vehicle having an opening formed in one part thereof, the opening of which has an inner peripheral brim; a roof panel of a size to be snugly fitted in the opening of the roof in a detachably attachable manner; a detachably attachable hinge member provided on the front edge of the roof panel and which is engaged with the inner peripheral brim of the roof opening; a toggle latch provided on the rear edge of the roof panel to be also engaged with the inner peripheral brim of the roof; a pivotal shaft for connecting one of link members of the toggle latch and the roof being inserted and withdrawn by the expanding and contracting operations of a connecting shaft for the links through the links, and the pivotal shaft being maintained in its fitted state by a spring provided on the connecting shaft; and a locking mechanism which inhibits contraction of the expanding and contracting connecting shaft and is capable of being released when the roof panel is to be removed from the roof opening, the locking mechanism of which is provided on the toggle latch.