The invention relates to a device for locking a door which can be mounted in a door (1), comprising: a housing, an operable push element (3a,3b) which is connected to the housing and which is tiltable relative to the housing when activated, a bolt (5) movable between a locking position and an opening position, and a rotatable coupling element (4a,4b) coupled between the bolt and the push element for causing, through a rotation of the coupling element, a movement of the bolt from the locking position to the opening position upon activation of the push element. The invention is characterized in that the push element is arranged in an access to a chamber in the housing, that in a starting position the push element is adapted to block the access to the chamber, and that the push element is tilted into the chamber when activated, wherein the chamber is accessible to the user.