Electronic component mounting method

An electronic component mounting method comprising:

• a first step for preparing a wiring substrate comprising a main surface and provided with conductive wirings and connecting terminals on the main surface, a group of electronic components consisting of a plurality of electronic components including at least a passive component, the respective electronic components comprising electrode terminals, and a resin composition including solder powder, convective additive and resin having fluidity at the melting temperature of the solder powder;
• a second step for applying the resin composition to the main surface of the wiring substrate;
• a third step for aligning positions of the connecting terminals and the electrode terminals and making the group of electronic components abut the surface of the resin composition,
• a fourth step for melting the solder powder by heating at least the resin composition, making the solder powder grown while making the solder powder self-assembled between the connecting terminals and the electrode terminals using the convective additive, and solder-connecting the connecting terminals and the electrode terminals to each other;
• and
• a fifth step for hardening the resin in the resin composition and fixedly adhering each of the group of electronic components to the wiring substrate using the hardened resin,
• wherein a temporary securing substrate comprising a plurality of recessed parts for separately housing the electronic components constituting the group of electronic components is prepared, the electronic components are inserted into the respective recessed parts of the temporary securing substrate and temporarily secured thereto, and the temporary securing substrate is positioned so as to face the resin composition so that the group of electronic components abut the resin composition by one operation in the third step, and
• the fourth step is performed while the state where the group of electronic components abuts the resin composition is retained.