A semiconductor device manufacturing method includes: applying solder to an arrangement area of a substrate, the substrate having a connection area to which a wiring member is to be directly connected, the connection area neighboring the arrangement area; arranging a component on the arrangement area via the solder; and soldering the component to the arrangement area by heating the solder while covering the connection area. A soldering support jig includes a columnar covering member having a covering surface at a bottom of the columnar covering member.