A construction method for a girder in a bridge in which a plurality of piers are installed in an interval in a longitudinal direction of the bridge, a plurality of copings are installed on the piers, and a plurality of girders respectively installed between the piers are installed on the copings. The method comprises the steps of: installing at least one temporary girder on a front coping of the copings and a rear coping adjacent to the rear coping of the copings; installing a crane for pulling up a girder having a girder pulling up space therein guided by the temporary girder; and providing with a girder by a pre-cast method so as to install a girder on the front coping and the rear coping.