To reduce the cost of a tool by constituting a puller tool for sheet metal to bulge a recessed part of the sheet metal through utilization of an extremely simple boosting mechanism of high boosting ratio and connection of small number of simple parts to correctly bulge the recessed part of the sheet metal.

A supporting base body 1 for abutting use made of metal or synthetic resin is provided with a leg body 14 having an abutting cushion 13 made of an insulation material on a tip part on each end of a beam member 12 having a through hole 11 for straight guide of a shaft in a center in an integrated manner or in a freely opening/closing and fixing manner. In a puller tool for sheet metal, a threaded shaft 37 in which a rotary body 36 provided with a lever handle 35 on one end is fixed is connected to a rear end part of a straight-moving shaft part 34 provided with a female screw hole 33 to integrate a pair of supporting plates 2 which are axially connected to the beam member 12 part and erected in a freely oscillating manner with a pull-up hook 31 on the tip or to change the pull-up hook 31 with a weld-up head 32, and a metallic shaft 3 for the puller to be inserted in the through hole 11 is provided.