A steering lock device includes a lock body attached to a column post that rotatably supports a steering shaft, and a steering lock unit that restricts or releases a rotation of the steering shaft by turning a key cylinder unit housed in the lock body. The steering lock unit includes a locking bar engageable with the steering shaft, a lock stopper holding the locking bar, a camshaft to convert a rotary motion of the key cylinder unit into a linear motion of the lock stopper, and a lock holder configured such that the lock stopper, the cam shaft and the locking bar are installed therein by being inserted thereinto in a same direction.