steering device comprising: a steering shaft which is axially rotatably supported by a column and which can be attached with a steering wheel at a portion thereof toward a vehicle rear side; a steering lock device which is attached to the column and which causes a lock pin operated by operation of an ignition key to engage the steering shaft so as to lock the steering shaft not to allow the steering shaft to rotate; a flange section (43, 44) projecting radially outwardly from the outer peripheral surface of the column and including a mounting surface (435, 445) to which a housing to accommodate the steering lock device is attached; and a bolt for clamping the housing to the mounting surface (435, 445); characterized in that the steering device further comprises: an engaging convex part which is formed on the steering lock device to project toward an outer peripheral surface of the column so as to position the steering lock device against the column; a through hole (45.) formed in the column such that there is a clearance between the through hole and an outer peripheral surface of the lock pin; and a guide groove which is formed on the outer peripheral surface of the column to extend in parallel with an axial direction of the column and which guides the engaging convex part from an axial end of the column to near the through hole, the guide groove having a groove width larger than a width of the engaging convex part, and in that the flange section (43, 44) is formed integrally with the column. a steering shaft which is axially rotatably supported by a column and which can be attached with a steering wheel at a portion thereof toward a vehicle rear side; a steering lock device which is attached to the column and which causes a lock pin operated by operation of an ignition key to engage the steering shaft so as to lock the steering shaft not to allow the steering shaft to rotate; a flange section (43, 44) projecting radially outwardly from the outer peripheral surface of the column and including a mounting surface (435, 445) to which a housing to accommodate the steering lock device is attached; and a bolt for clamping the housing to the mounting surface (435, 445); characterized in that the steering device further comprises: an engaging convex part which is formed on the steering lock device to project toward an outer peripheral surface of the column so as to position the steering lock device against the column; a through hole (45.) formed in the column such that there is a clearance between the through hole and an outer peripheral surface of the lock pin; and a guide groove which is formed on the outer peripheral surface of the column to extend in parallel with an axial direction of the column and which guides the engaging convex part from an axial end of the column to near the through hole, the guide groove having a groove width larger than a width of the engaging convex part, and in that the flange section (43, 44) is formed integrally with the column. an engaging convex part which is formed on the steering lock device to project toward an outer peripheral surface of the column so as to position the steering lock device against the column; a through hole (45.) formed in the column such that there is a clearance between the through hole and an outer peripheral surface of the lock pin; and a guide groove which is formed on the outer peripheral surface of the column to extend in parallel with an axial direction of the column and which guides the engaging convex part from an axial end of the column to near the through hole, the guide groove having a groove width larger than a width of the engaging convex part, and in that the flange section (43, 44) is formed integrally with the column.