A fitting comprising: a metal member comprising at least two separated sub metal members (400, 402; 1000, 1002; 1402,1404); a body (100, 700, 1200, 1606) comprising a body member (100a, 700a, 1200a) and a body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d) formed at an end part of the body member (100a, 700a, 1200a); and a liner (102, 702, 1202, 1600), wherein the sub metal members (400, 402; 1000, 1002; 1402, 1404) are included in the body (100, 700, 1200, 1606), and the body (100, 700, 1200, 1606) is formed of plastic, wherein the sub meal members (400, 402; 1000, 1002; 1402, 1404) surround the liner (102, 702, 1202, 1600), a fluid flow space (120; 712; 1212, 1214) through which fluid can flow is formed in the liner (102, 702, 1202, 1600), the liner (102, 702, 1202, 1600) is formed of fluorine resin and comprises a liner body member (102a, 702a) and a liner flange member (102b, 102c; 702b, 702c) formed at an end part of the liner body member (102a, 702a), at least one of the sub metal members (400, 402; 1000, 1002; 1402, 1404) comprises a sub body member (400a, 1000a, 1402a) and a sub flange member (400b, 400c; 1000b, 1000c; 1402b, 1402c, 1402d) formed at an end part of the sub body member (400a, 1000a, 1402a), wherein a width of the sub flange member (400b, 400c; 1000b, 1000c; 1402b, 1402c, 1402d) is higher than a width of the liner flange member (102b, 102c; 702b, 702c), and the sub flange member (400b, 400c; 1000b, 1000c; 1402b, 1402c, 1402d) surrounds the liner body member (102a, 702a) just beneath the liner flange member (102b, 102c; 702b, 702c), and wherein no part included in the body member (100a, 700a, 1200a) of the sub metal members (400, 402; 1000, 1002; 1402, 1404) is exposed outside as the part is covered by the body member (100a, 700a, 1200a), and a part included in the body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d) of the sub metal members (400, 402; 1000, 1002; 1402, 1404) is not exposed outside an outer surface of the body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d) as the part is covered by the body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d). a metal member comprising at least two separated sub metal members (400, 402; 1000, 1002; 1402,1404); a body (100, 700, 1200, 1606) comprising a body member (100a, 700a, 1200a) and a body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d) formed at an end part of the body member (100a, 700a, 1200a); and a liner (102, 702, 1202, 1600), wherein the sub metal members (400, 402; 1000, 1002; 1402, 1404) are included in the body (100, 700, 1200, 1606), and the body (100, 700, 1200, 1606) is formed of plastic, wherein the sub meal members (400, 402; 1000, 1002; 1402, 1404) surround the liner (102, 702, 1202, 1600), a fluid flow space (120; 712; 1212, 1214) through which fluid can flow is formed in the liner (102, 702, 1202, 1600), the liner (102, 702, 1202, 1600) is formed of fluorine resin and comprises a liner body member (102a, 702a) and a liner flange member (102b, 102c; 702b, 702c) formed at an end part of the liner body member (102a, 702a), at least one of the sub metal members (400, 402; 1000, 1002; 1402, 1404) comprises a sub body member (400a, 1000a, 1402a) and a sub flange member (400b, 400c; 1000b, 1000c; 1402b, 1402c, 1402d) formed at an end part of the sub body member (400a, 1000a, 1402a), wherein a width of the sub flange member (400b, 400c; 1000b, 1000c; 1402b, 1402c, 1402d) is higher than a width of the liner flange member (102b, 102c; 702b, 702c), and the sub flange member (400b, 400c; 1000b, 1000c; 1402b, 1402c, 1402d) surrounds the liner body member (102a, 702a) just beneath the liner flange member (102b, 102c; 702b, 702c), and wherein no part included in the body member (100a, 700a, 1200a) of the sub metal members (400, 402; 1000, 1002; 1402, 1404) is exposed outside as the part is covered by the body member (100a, 700a, 1200a), and a part included in the body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d) of the sub metal members (400, 402; 1000, 1002; 1402, 1404) is not exposed outside an outer surface of the body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d) as the part is covered by the body flange member (100b, 100c; 700b, 700c; 1200b, 1200c, 1200d).