A supporting member construction for a balcony guard rail to interconnect a plurality of supporting members of the balcony guard rail for erecting the balcony guard rail, wherein the supporting member construction comprises a first supporting member of the balcony guard rail, a second supporting member of the balcony guard rail and a coupling piece in order to interconnect the first supporting member and the second supporting member with the coupling piece, wherein a first guiding system is present in order to connect the first supporting member to the coupling piece forming positive engagement, and a second guiding system is present in order to connect the second supporting member to the coupling piece forming positive engagement, so that both the first supporting member can be displaced in a guided manner relative to the coupling piece and the second supporting member can be displaced in a guided manner relative to the coupling piece in order to configure a relative position of the first supporting member relative to the second supporting member, wherein in the respective displacement state, there is no positive connection between the coupling piece and the respective supporting member in a direction orthogonal to the respective displacement direction, so the coupling piece can be detached from the respective supporting member by moving the coupling piece orthogonally to the respective displacement direction, wherein the first guiding system and/or second guiding system has one first guide element in each case, which is part of the respective supporting member or is connected to the same, and one second guide element in each case, which is part of the coupling piece or is connected to the same, wherein one of the guide elements is designed with a guide receptacle, which is formed for example in the form of a channel or a groove, and the other guide element is formed with a guide pin corresponding to the shape of the guide receptacle, which guide pin can be inserted at least partially into the guide receptacle for connecting the respective supporting member to the coupling piece forming the positive engagement, so that the guide pin can be displaced in the guide receptacle in a guided manner, wherein in the displacement state, there is no positive connection between the coupling piece and the first or second supporting member in a direction counter to an insertion direction of the guide pin of the coupling piece into the guide receptacle, which insertion direction is aligned orthogonally to the displacement direction, so the coupling piece can be detached from the respective supporting member by moving the coupling piece orthogonally to the displacement direction, wherein the first guiding system and second guiding system in each case has a blocking device, which can be deactivated and in particular is formed using a stop element, in order to block a guided displacement of the coupling piece relative to the respective supporting member in at least one of the displacement directions and to enable the same if the blocking device is deactivated, wherein sliding out or detachment of the guide pin counter to the insertion direction of the guide pin into the guide receptacle is suppressed using the blocking device in the other supporting member by blocking a movement of the coupling piece counter to the insertion direction.