This invention relates to a portable supporting structure for a firearm having a detachable cradle to hold the firearm mounted on an elongated tubular member, a spindle mechanism operably adapted to fix the detachable cradle with the elongated tubular member at a proximal end, a lever operably adapted to adjust the height of the elongated tubular member and a base platform to hold the elongated tubular member. Further, the portable supporting structure is simple and inexpensive to manufacture.