To provide an arm member and a method of manufacturing the arm member capable of ensuring strength in holding a ball part using a swaged part of a housing. An arm member (1) includes a ball joint (2) and an arm part (3) . The ball joint (2) has a ball stud (5) including a ball part (6). The ball joint (2) has a housing (15) including a swaged part (28) and holds the ball part (6) inside the housing (15) using deformation of the swaged part (28) . The arm part (3) has an arm part body (30) made of discontinuous fiber-reinforced resin and continuous with the housing (15) . The arm part (3) has a covering part (31) made of continuous fiber-reinforced resin and covering at least a part of the swaged part (28).