A steering lock device , used with a vehicle shift lever that is shifted to a parking position and a non-parking position, the steering lock device comprising: a camshaft including a shaft portion having an axis (L1), a lock actuation cam that radially projects from a first position of the shaft portion in an axial direction, and a projection that radially projects from a second position of the shaft portion that differs from the first position in the axial direction, wherein the camshaft is rotated about the axis (L1) when a key cylinder is operated by a mechanical key ; a housing that rotatably accommodates the camshaft , the key cylinder is coupled to the housing , the housing includes an interlock attachment portion configured to attach a key interlock unit that prohibits removal of the mechanical key from the key cylinder unless the shift lever is shifted to the parking position; and a lock bar that is moved by the lock actuation cam in a locking direction or an unlocking direction when the camshaft is rotated, wherein when the lock bar is moved in the locking direction, the lock bar engages a steering shaft to lock the steering shaft , and when the lock bar is moved in the unlocking direction, the lock bar is disengaged from the steering shaft to unlock the steering shaft , characterized in that when the lock bar locks the steering shaft , the camshaft is configured so that the projection that includes a cam-shaped interlock cam that actuates the key interlock unit is separated from the shaft portion if a load exceeding a predetermined strength acts on the projection of the camshaft , wherein the predetermined strength rotates the lock actuation cam to disengage the lock bar from the steering shaft . a camshaft including a shaft portion having an axis (L1), a lock actuation cam that radially projects from a first position of the shaft portion in an axial direction, and a projection that radially projects from a second position of the shaft portion that differs from the first position in the axial direction, wherein the camshaft is rotated about the axis (L1) when a key cylinder is operated by a mechanical key ; a housing that rotatably accommodates the camshaft , the key cylinder is coupled to the housing , the housing includes an interlock attachment portion configured to attach a key interlock unit that prohibits removal of the mechanical key from the key cylinder unless the shift lever is shifted to the parking position; and a lock bar that is moved by the lock actuation cam in a locking direction or an unlocking direction when the camshaft is rotated, wherein when the lock bar is moved in the locking direction, the lock bar engages a steering shaft to lock the steering shaft , and when the lock bar is moved in the unlocking direction, the lock bar is disengaged from the steering shaft to unlock the steering shaft , characterized in that when the lock bar locks the steering shaft , the camshaft is configured so that the projection that includes a cam-shaped interlock cam that actuates the key interlock unit is separated from the shaft portion if a load exceeding a predetermined strength acts on the projection of the camshaft , wherein the predetermined strength rotates the lock actuation cam to disengage the lock bar from the steering shaft . <EOS>