Abstract: A sign holder having two identical support members, one in a lower position and one in an upper position. Pockets in the support members hold the edges of a sign, and extendable arms telescoping from each end of the support members have curved ends for engaging the edges of a vehicle door. Each arm is fastened to the inside surface of the door edge with a set screw. Door-abutting faces of each arm are lined with soft material, and door-adjacent faces of the support members have rubber nubs attached thereto so that the door's finish will not be scratched or marred.