A lock device (1,2) for a double door, the lock device (1,2) comprising - a first lock part for mounting on a first wall of a first door of the double door, which first lock part comprises a first exterior part and a first interior part, - a second lock part for mounting on a second wall of a second door of the double door for locking together with the first lock part in closed position of the double door, which second lock part comprises a second exterior part and a second interior part, and - a lock, - the first lock part comprises a first bolt means (5,5a,5b,5c) having a first length selected to screw the first exterior part and the first interior part together through the first wall of the first door, - the second lock part comprises a second bolt means (48,48a,48b) having a second length selected to screw the second exterior part and the second interior part together through the second wall of the second door, and - the first interior part has female first locking profile and/or engagement means for engaging a male second locking profile and/or engagement means of the second interior part, characterised in that - the first interior part has a first plate having the first locking profile provided on a first edge, - the second interior part has a second plate having the second locking profile provided on a second edge, - which first locking profile and second locking profile are adapted to interlock and/or engage in the closed position of the double door, wherein - the first locking profile protrudes substantially perpendicular from the first edge away from the first exterior part to define a locking groove, cavity or gap along the first edge, - the second locking profile protrudes substantially perpendicular from the second edge away from the second exterior part to define a locking protrusion along the second edge. - a first lock part for mounting on a first wall of a first door of the double door, which first lock part comprises a first exterior part and a first interior part, - a second lock part for mounting on a second wall of a second door of the double door for locking together with the first lock part in closed position of the double door, which second lock part comprises a second exterior part and a second interior part, and - a lock, - the first lock part comprises a first bolt means (5,5a,5b,5c) having a first length selected to screw the first exterior part and the first interior part together through the first wall of the first door, - the second lock part comprises a second bolt means (48,48a,48b) having a second length selected to screw the second exterior part and the second interior part together through the second wall of the second door, and - the first interior part has female first locking profile and/or engagement means for engaging a male second locking profile and/or engagement means of the second interior part, - the first interior part has a first plate having the first locking profile provided on a first edge, - the second interior part has a second plate having the second locking profile provided on a second edge, - which first locking profile and second locking profile are adapted to interlock and/or engage in the closed position of the double door, wherein - the first locking profile protrudes substantially perpendicular from the first edge away from the first exterior part to define a locking groove, cavity or gap along the first edge, - the second locking profile protrudes substantially perpendicular from the second edge away from the second exterior part to define a locking protrusion along the second edge.