To mount a whole apparatus on a floor by three-point support and to select the angle of a coating material cup easily and promptly in accordance with the angle of a substrate surface by making a fitting angle freely changeable by setting a ground joint between the bottom part of the coating material cup and a fitting nut.

The tip 8 of the coating material discharge pipe 7 of a coating material cup 2 is inserted into the receiving port 9 of a spray gun 1, and both are linked/fixed together by tightening a thumbscrew 3. A joint 5 has an inner cylinder in which an outer screw 12 is formed on the periphery of the discharge pipe 7 end part and an outer cylinder 14 having in an inner screw 13 which engages with the inner cylinder 11. A sliding body 17 is formed over the inner voids of the inner cylinder 11 and the outer cylinder, a projected fringe part is formed in the outer cylinder side end part, and a connection pipe 18 is put/ fixed into/to its center. Passages are formed in the sliding body 17 and the connection pipe 18. Sealing rings 21, 22 are formed in on the inner bottoms of the inner cylinder 11 and the outer cylinder 14, respectively. A bolt 6' for adjusting a projection quantity is inserted into a support projection 6 formed in the bottom part 2' of the coating material cup 2.