a steering lock system includes a shift lever device in which a shift lever is operatively installed and a steering lock device in which a key cylinder is operatively disposed . in the system there is arranged a combination with a plug which is detachably fitted into an opening formed in a housing of the steering lock device ; a slider movably disposed in the plug in a manner to be projectable into the housing through the opening , the slider being movable between a blocking position wherein the slider blocks rotation of the key cylinder of the steering lock device and a release position wherein the slider fails to block the rotation of the key cylinder ; a resiliently flexible clip detachably fixed to the housing for achieving a tight connection between the plug and the housing ; a bellcrank arranged to control movement of the shift lever of the shift lever device ; and a cable member extending between the slider and the control member .