Abstract: A jack stand or support for a trailer jack having a vertically extending housing and an extensible plunger telescopically contained by the depending end of the jack housing includes an upright member mounted on a flat base. A sleeve-like socket, in which the upper end of the upright member is telescopically received, is secured to the depending end of the jack plunger. The socket member is pivotally mounted in elongated slots formed in parallel strap members secured to the upright member for a lateral pivoting movement of the jack stand to a stored travel position by rollers on the strap members contacting forwardly and rearwardly extending arcuate tracks, mounted on the jack housing, during retracting movement of the plunger into the housing.