A steering lock device includes a supporting bracket (5) which is attached to a steering lock body (4) including a lock member (6) restricting rotation of a steering shaft (2) within a steering column and is fastened to the steering lock body (4) to fix the steering lock body (4) to the steering column. The supporting bracket (5) includes a shaft supporting portion (12) pivotally supported by a supporting shaft (10); a shaft support cancellation preventing portion (13) preventing damage to the pivotable support of the shaft supporting portion (12) by the supporting shaft (10); and an engagement holding portion (14) holding the shaft support cancellation preventing portion (12). The steering body is provided with bearing portions (11) through which the supporting shaft is inserted.