To make it difficult to find out a locking position and strengthen the locking condition even if a robber tries to open a door by urging a knockpin of a bar lock penetrated between a doorbody and a member retaining it in the closed state so as to always deviate to the locking direction by the own body or a forced pin.

A knockpin 11 is inserted in a knockpin-insertion hole 10 provided between a door body 2 and a door frame 3 and a bar lock is inserted in between a part of the door body 2 and the door frame 3, in a locking device 1 provided between the door frame 3 and the upper edge or the like of the free end side of the door body 2, in an entrance door of an apartment house or the like. A knockpin-insertion hole 100A provided at the opened free end of the door body 2 and a knockpin-insertion hole 10B provided at the upper part of the stile of time door frame 3 are opened in the declining direction toward the door body 2 side to form a straight line and have a deviating inclination to the locking direction by itself. When it is drawn out, if the knockpin 11 itself has an attractive magnetic force, a drawing key provided with a magnet piece is used for instance.