Railing apparatus for a scaffold with scaffolding levels (52, 54), which scaffold has vertical members /vertical frames arranged spaced apart in the width direction, has crossbars connected to the vertical members /vertical frames in the transverse direction, has existing guard rails connected to the vertical members /vertical frames in the width direction, and has decks, and/or toe boards, connected to crossbars in the width direction, - wherein the railing apparatus is configured as a so-called lead railing apparatus, which, from an existing lower scaffolding level, can be mounted for an upper scaffolding level to be mounted thereabove and which then forms in particular temporary side protection for the upper scaffolding level, - having railing posts and temporary guard rails, wherein the railing posts each have -- a first connection device which is arranged in the upper end region of the railing post and serves for releasable connection of one or two temporary guard rails, and -- further connection devices (14, 16) which serve for releasable connection to the vertical member, in particular a second connection device and a third connection device, - wherein the first connection device is configured such that, in the state of connection to the vertical member of the scaffold, it extends towards the scaffold as a projection device in the transverse direction, - wherein the first connection device has in the transverse direction two projecting projection units which are spaced apart in the width direction and in whose end region there is provided in each case one connection unit for a temporary guard rail and whose clear inner spacing is larger than the outer diameter of the vertical member, characterized in that - the length of the projection units in the transverse direction is configured in such a way that each connection unit, when seen in plan view, is arranged laterally offset from the vertical member at the height thereof or beyond this in the direction of the toe board /deck, - whereby the first connection device is configured in such a way that, with guard rails connected to the first connection device and with railing posts connected to the vertical member, that is to say with the railing apparatus connected to the scaffold, when seen in plan view, the dimension ZA in the transverse direction of the spacing of the inner edge, directed towards the scaffold, of the temporary guard rail to the outer edge of the toe board or of the deck of the scaffold is less than or equal to a permissible spacing dimension of 80 mm (millimetres). - wherein the railing apparatus is configured as a so-called lead railing apparatus, which, from an existing lower scaffolding level, can be mounted for an upper scaffolding level to be mounted thereabove and which then forms in particular temporary side protection for the upper scaffolding level, - having railing posts and temporary guard rails, wherein the railing posts each have -- a first connection device which is arranged in the upper end region of the railing post and serves for releasable connection of one or two temporary guard rails, and -- further connection devices (14, 16) which serve for releasable connection to the vertical member, in particular a second connection device and a third connection device, -- a first connection device which is arranged in the upper end region of the railing post and serves for releasable connection of one or two temporary guard rails, and -- further connection devices (14, 16) which serve for releasable connection to the vertical member, in particular a second connection device and a third connection device, - wherein the first connection device is configured such that, in the state of connection to the vertical member of the scaffold, it extends towards the scaffold as a projection device in the transverse direction, - wherein the first connection device has in the transverse direction two projecting projection units which are spaced apart in the width direction and in whose end region there is provided in each case one connection unit for a temporary guard rail and whose clear inner spacing is larger than the outer diameter of the vertical member, - the length of the projection units in the transverse direction is configured in such a way that each connection unit, when seen in plan view, is arranged laterally offset from the vertical member at the height thereof or beyond this in the direction of the toe board /deck, - whereby the first connection device is configured in such a way that, with guard rails connected to the first connection device and with railing posts connected to the vertical member, that is to say with the railing apparatus connected to the scaffold, when seen in plan view, the dimension ZA in the transverse direction of the spacing of the inner edge, directed towards the scaffold, of the temporary guard rail to the outer edge of the toe board or of the deck of the scaffold is less than or equal to a permissible spacing dimension of 80 mm (millimetres).