To provide a joint mechanism of a folding type clothes-drying tool facilitating the assembling of a body frame without using a connecting pin to a joint part and eliminating any danger of catching a finger, or the like, in developing the body frame.

This joint mechanism is so constituted that a joint part extending from opposed two sides of a rectangular body frame comprises an approximately recessed first joint part having ribs linked on respective inside planes of approximately circular and clamp bodies, which are opposed to each other with an insertion hole formed in the center, with a virtual central line extending horizontally from the central point of the insertion hole set to a lower side, and an approximately projecting second joint part having ribs linked on an approximately circular clamp counter-body, which has fitting projection parts formed in the centers of the both surfaces, with a virtual central line extending horizontally from, at least, 1/2 of a circumferential part and the central point of the fitting projection part set to an upper side.