To quickly carry out sure engagement and to easily carry out engaging work even in an unstable working position.

A suspension hanging joint 11 connecting a wire rope 7, which is wound up by means of an elevating device arranged in a mother ship, to a simultaneous removing device 10, which is arranged in a small ship 3 mounted in the mother ship and lifted/lowered between above the ship and the water surface by means of the elevating device, is constructed of a ring member 20 provided with a through hole, through which the wire rope 7 is passed and supported, and a ring member 21 connected rotationally relatively to a supporting shaft integrally formed with the ring member 20 and provided with an elongated hole 21d larger the through hole. The ring member 21 is engaged with the simultaneous removal device 10 removably.