A valve timing controller includes a first housing; a second housing fixed to the first housing; a driven rotor inside of a driving rotor defined by the first housing and the second housing; a revolving actuator disposed on an extension of an axial direction of the driven rotor; a deceleration mechanism; and an engaging part that is engaged with a lock jig locking a relative rotation between the driving rotor and an input rotor of the deceleration mechanism in advance of assembling the valve timing controller to an internal-combustion engine. The engaging part is located on a radially inner side compared with an insertion part of the revolving actuator inserted in a hole of a cover component of the internal-combustion engine.