Abstract: A support tray for a ladder, scaffold and the like that includes a load-bearing support bar or strut that is secured to ladder structure below the tray and includes means for adjusting the length of the support bar to maintain the tray in a substantially horizontal disposition for supporting paint containers, tools and the like regardless of the particular ladder step spacing or its angle of disposition at the workplace. The support tray is detachable and adapted to be secured to and removed from a ladder and adapted to support tools, paint containers on a substantially planar floor member and integral upstanding walls. A tray member securing device of clamp is operatively connected to the tray member for securing the tray member to the ladder in a horizontal position at a predetermined height of the ladder.