A joint device includes a first latch, an actuating mechanism, and two connection parts pivotally connected to each other. The first latch is selectively moved to a first locking position for locking the two connection parts or a first unlocking position for unlocking the two connection parts. The actuating mechanism is disposed adjacent to where the two connection parts are pivotally connected. The actuating mechanism is connected to the first latch to be operable to selectively move the first latch to the first locking position or the first unlocking position, and it facilitates operation of unfolding and folding a stroller equipped with the joint device of the invention.