To facilitate fluid jet operation of a spray device by providing the tip part of a socket body with lock mechanism detachable from an outer peripheral groove of a plug body provided at a connected body, and providing the rear end inside of the socket body with a pressing part for pressing a nozzle of the spray device.

In case of connecting a fitting member 3 to a spray end part 80 of a spray device, an end part with a slit 33 formed, of the fitting member 3 is contacted in diameter and fitted inside the spray end part 80, and a locking protruding part 31 of the fitting member 3 and a flange part 82 of the spray end part 80 are engaged with each other. The tip of a plug body 9 is then inserted in the opening end part of a cylinder part 20, and a diameter enlarged part 92 of the plug body 9 is moved while being brought into contact with the tapered face of an inner sleeve 63 so as to open oblong holes 61a, 61a of the cylinder part 20 and to make locking members 61, 61 movable. An operating sleeve 62 is therefore moved being pushed by a spring 64, and the locking members 61, 61 and an outer peripheral groove 91 of the plug body 9 are engaged with each other to put a socket body 2 and the plug body 9 in a connected state.