To easily mount a chain by making the construction into a side plate type, and easily replace touch chains.

This connecting device of a chain for automobile is constituted of side plates 2 continuously provided on both sides of a tire 1, connecting bodies 3 connecting together the side plates 2 and connecting together tie plates 4 provided on both ends of touch chains 15, and mounting rubber rings 18. The connecting body 3 and the tie plate 4 are connected together by a bolt of rectangular head which is long in one direction, the connecting hole of the tie plate is formed into the same form capably of being inserted with the bolt head, and they can be detachably locked with each other by changing the direction of the bolt head after inserting. The bolt head is not angularly moved after locking by elastic force of a curved washer.