A shift control device comprising: a sleeve; and a shift fork that moves the sleeve in an axial direction; wherein the sleeve includes a sleeve main body that is annular in shape; and a first convex section that is annular in shape and protruded radially outward from an outer circumferential surface of the sleeve main body; wherein the shift fork includes a fork main body that is annular in shape and disposed radially outside the sleeve main body, a second convex section that is annular in shape, axially disposed side by side with the first convex section, and protruded radially inward from an inner circumferential surface of the fork main body; the shift control device being characterised by further comprising: a ring that is annular in shape and disposed to axially sandwich the first convex section between the ring and the second convex section, and a joining member that joins the ring to the fork main body; wherein the ring is configured such that a first groove is formed in an outer circumferential surface of the ring and extended in a circumferential direction; wherein the fork main body includes a first surface that is cylindrically shaped, connected to an axial end face of the fork main body, and larger in diameter than the inner circumferential surface of the fork main body, and a second surface that connects the first surface to the inner circumferential surface of the fork main body; wherein a second groove is formed in the first surface and extended in a circumferential direction with an opening formed to reach the second groove; and wherein, in a state where the outer circumferential surface of the ring is in contact with the first surface and an axial end face of the ring is in contact with the second surface, the joining member is disposed in a space formed by the first groove and the second groove. a sleeve; and a shift fork that moves the sleeve in an axial direction; wherein the sleeve includes a sleeve main body that is annular in shape; and a first convex section that is annular in shape and protruded radially outward from an outer circumferential surface of the sleeve main body; wherein the shift fork includes a fork main body that is annular in shape and disposed radially outside the sleeve main body, a second convex section that is annular in shape, axially disposed side by side with the first convex section, and protruded radially inward from an inner circumferential surface of the fork main body; the shift control device being characterised by further comprising: a ring that is annular in shape and disposed to axially sandwich the first convex section between the ring and the second convex section, and a joining member that joins the ring to the fork main body; wherein the ring is configured such that a first groove is formed in an outer circumferential surface of the ring and extended in a circumferential direction; wherein the fork main body includes a first surface that is cylindrically shaped, connected to an axial end face of the fork main body, and larger in diameter than the inner circumferential surface of the fork main body, and a second surface that connects the first surface to the inner circumferential surface of the fork main body; wherein a second groove is formed in the first surface and extended in a circumferential direction with an opening formed to reach the second groove; and wherein, in a state where the outer circumferential surface of the ring is in contact with the first surface and an axial end face of the ring is in contact with the second surface, the joining member is disposed in a space formed by the first groove and the second groove. a ring that is annular in shape and disposed to axially sandwich the first convex section between the ring and the second convex section, and a joining member that joins the ring to the fork main body; wherein the ring is configured such that a first groove is formed in an outer circumferential surface of the ring and extended in a circumferential direction; wherein the fork main body includes a first surface that is cylindrically shaped, connected to an axial end face of the fork main body, and larger in diameter than the inner circumferential surface of the fork main body, and a second surface that connects the first surface to the inner circumferential surface of the fork main body; wherein a second groove is formed in the first surface and extended in a circumferential direction with an opening formed to reach the second groove; and wherein, in a state where the outer circumferential surface of the ring is in contact with the first surface and an axial end face of the ring is in contact with the second surface, the joining member is disposed in a space formed by the first groove and the second groove.