To provide a subsidiary longitudinal frame comprising a lock projection for easily fitting a balustrade and a brace mounted to a support post which is temporarily provided, in a temporary scaffold.

A subsidiary longitudinal frame 1 which is moved for lifting and turning in an outer circumference of a temporary support post A is formed from a hollow body. The subsidiary longitudinal frame 1 is formed in a length of a predetermined interval and to the upper and lower end portions thereof, a mounting plate and a lock projection 3 are mounted. A fixed part of a fastening metal fitting 5 is fixed to the mounting plate. Furthermore, the subsidiary longitudinal frame is strongly wound and fixed around the temporary support post A by the fixed part and a movable part confronted with the fixed part.