Locking mechanism and endoscope

The utility model provides a locking mechanism and an endoscope. The locking mechanism and the endoscope can solve the problem that the direction of the far end of an insertion part cannot be stably locked at a required angle. The locking mechanism comprises: an operation part housing having a locking position, an unlocking position and a limiting position located in a path between the locking position and the unlocking position; the steering control wheel is rotatably arranged on the operation part shell, and the radial distance between the rotating axis of the steering control wheel and the locking position is smaller than the radial distance between the rotating axis of the steering control wheel and the unlocking position; the shifting locking piece comprises a shifting part and a locking part which are rotatably arranged on the operation part shell, and the locking part comprises a connecting arm connected with the shifting part and a locking arm axially extending from the connecting arm so as to slide b