Disclosed is a push-button lock for locking a plug-in connector housing. The lock has a push-button body with a cylindrical unlocking recess containing an unlocking pin. The appropriate interaction of an outer contour of the unlocking pin, an inner contour of a through-opening of the plug-in connector housing and the push-button body by at least one locking element and two springs allows the plug-in connector housing to be locked and unlocked with great ease of use, the operating concept being particularly self-explanatory.